Fixes the privacy policy showing up after being accepted (#5298)

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## About The Pull Request
See the title. Also fixes:
https://github.com/Bubberstation/Bubberstation/issues/5297
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## Why It's Good For The Game
Fixes good
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## Proof Of Testing
It didn't pop up when I joined the game locally.
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🆑
fix: The privacy policy no longer pops up after you've already accepted
it once.
/🆑

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config/privacy_policy.txt

@@ -64,7 +64,7 @@ We honor your rights to your data, including those provided under regulations li
 
 How to Make a Request:
 
-To exercise any of these rights, you must contact us via the designated contact email below.
+To exercise any of these rights, you must contact us via the designated contact email at the bottom of the policy page.
 
 Limitations:
 
@@ -75,7 +75,7 @@ Limitations:
 
 8. CHILDREN’S PRIVACY
 
-Bubberstation prohibits minors from using it’s platforms. Bubberstation is forbidden for persons under the age of 18 and the applicable age of majority in the jurisdiction from which Bubberstation is accessed. As indicated throughout this Privacy Notice, some users may be asked to provide some information to us and our service providers for us to make sure that you are over the age of majority required to have access to Bubberstation. We do not knowingly process personal information from minors. If you are the parent or legal guardian of a minor who has provided us with personal information, then please contact us at https://discord.gg/AvjrTqnqEx in the #contact-staff channel to have that minor’s personal information deleted.
+Bubberstation prohibits minors from using its platforms. Bubberstation is forbidden for persons under the age of 18 and the applicable age of majority in the jurisdiction from which Bubberstation is accessed. As indicated throughout this Privacy Notice, some users may be asked to provide some information to us and our service providers for us to make sure that you are over the age of majority required to have access to Bubberstation. We do not knowingly process personal information from minors. If you are the parent or legal guardian of a minor who has provided us with personal information, then please contact us at contact.bubberstation@gmail.com to have that minor’s personal information deleted.
 
 9. CHANGES TO THIS PRIVACY POLICY
 
@@ -83,4 +83,4 @@ We reserve the right to modify this Privacy Policy at any time. Any changes will
 
 10. CONTACT US
 
-If you have any questions about this Privacy Policy or wish to exercise your data rights, please contact us: https://discord.gg/AvjrTqnqEx at #contact-staff
+If you have any questions about this Privacy Policy or wish to exercise your data rights, please contact us: contact.bubberstation@gmail.com

modular_zubbers/code/modules/client/preferences_savefile.dm

@@ -0,0 +1,7 @@
+/datum/preferences/load_preferences()
+	. = ..()
+	savefile.get_entry("privacy_policy_acknowledged", privacy_policy_acknowledged)
+
+/datum/preferences/save_preferences()
+	. = ..()
+	savefile.set_entry("privacy_policy_acknowledged", privacy_policy_acknowledged)

tgstation.dme

@@ -9296,6 +9296,7 @@
 #include "modular_zubbers\code\modules\client\client_color.dm"
 #include "modular_zubbers\code\modules\client\client_procs.dm"
 #include "modular_zubbers\code\modules\client\preferences.dm"
+#include "modular_zubbers\code\modules\client\preferences_savefile.dm"
 #include "modular_zubbers\code\modules\client\ssd.dm"
 #include "modular_zubbers\code\modules\client\autopunctuation\preferences.dm"
 #include "modular_zubbers\code\modules\client\flavor_text\flavor_text.dm"