slime puddles look better and cant be abused by lings (#13567)

* perfect

* further changes

* no squeaking please

* no more squeaking damnit

* no more squeaking damnit

* slower

* they get broken armor

* broken armor application

* Apply suggestions from code review

* add a comma

* make crossed work properly

* Update squeak.dm

Co-authored-by: Ghom <42542238+Ghommie@users.noreply.github.com>

code/modules/movespeed/modifiers/innate.dm

@@ -20,5 +20,6 @@
 	flags = IGNORE_NOSLOW
 
 /datum/movespeed_modifier/slime_puddle
-	multiplicative_slowdown = 2
+	multiplicative_slowdown = 4.5
 	flags = IGNORE_NOSLOW
+	variable = TRUE