Fixes default FPS and makes it apply to new players (#61957)

Co-authored-by: Watermelon914 <3052169-Watermelon914@users.noreply.gitlab.com>
Co-authored-by: Mothblocks <35135081+Mothblocks@users.noreply.github.com>

code/modules/client/preferences.dm

@@ -114,8 +114,9 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 			return
 	//we couldn't load character data so just randomize the character appearance + name
 	randomise_appearance_prefs() //let's create a random character then - rather than a fat, bald and naked man.
-
-	C?.set_macros()
+	if(C)
+		apply_all_client_preferences()
+		C.set_macros()
 
 	if(!loaded_preferences_successfully)
 		save_preferences()

code/modules/client/preferences/fps.dm

@@ -6,6 +6,9 @@
 	minimum = -1
 	maximum = 240
 
+/datum/preference/numeric/fps/create_default_value()
+	return -1
+
 /datum/preference/numeric/fps/apply_to_client(client/client, value)
 	client.fps = (value < 0) ? RECOMMENDED_FPS : value