Add safe return

otherwise the implicit return is at the end of the file, which means if we add another label down the file, it will be executed after give_gift

(cherry picked from commit 38787bdc4c)

game/scripts/interface/gifts.rpy

@@ -11,6 +11,7 @@ label give_gift(text, gift):
     hide screen gift
     with d3
     $ gift.owned -= 1
+    return
 
 screen gift(gift):
     zorder 30