Fix Tracker Island Backgrounds

- Fix regression from 308b15e (I have no idea why I changed this?)

Author: SuperDude88

gui/desktop/mainwindow.ui

@@ -2480,7 +2480,7 @@ color: lightgray</string>
                <cursorShape>ArrowCursor</cursorShape>
               </property>
               <property name="autoFillBackground">
-               <bool>false</bool>
+               <bool>true</bool>
               </property>
               <property name="styleSheet">
                <string notr="true"/>