Get rid of trailing whitespace.

Commit generated by command:

find -type f ! -path '*.git*' ! -path '*.png' ! -path '*.ico' ! -path \
    '*.ogg' | xargs -I '{}' sed -i '{}' -e 's/\t*$//g' -e 's/ *$//g'

modules/client_options/graphics.otui

@@ -39,10 +39,10 @@ Panel
     id: fullscreen
     !text: tr('Fullscreen')
     tooltip: Ctrl+Shift+F
-    
+
   OptionCheckBox
     id: dontStretchShrink
-    !text: tr('Don\'t stretch/shrink Game Window')  
+    !text: tr('Don\'t stretch/shrink Game Window')
 
   Label
     id: backgroundFrameRateLabel