End Credits: reduced text surface size by 42%

[ci skip]

Really no reason for the text area to grow since the text is set in pre_show and
therefor the widget is always the right size. >_<

data/gui/window/end_credits.cfg

@@ -93,8 +93,7 @@
 
 								[column]
 									grow_factor = 1
-									horizontal_grow = true
-									vertical_grow = true
+									horizontal_alignment = "center"
 
 									[scroll_label]
 										id = "text"