Fix OutlineCloseButton default for close tab buttons

Under Window Decorations, the option "Draw a circle around close button"
is unchecked by default. This normally applies to both window and tab close buttons, but tab buttons permanently had the circle visible because this boolean was incorrect.

This made it impossible for the user to disable this style via GUI. `OutlineCloseButton=false` had to be explicitly added to `~/.config/breezerc`.

Fixes a regression that started in the 5.23 cycle.

BUG: 448122
FIXED-IN: 5.24


(cherry picked from commit f2d33bd33e)

kstyle/breeze.kcfg

@@ -33,7 +33,7 @@
 
     <!-- close button -->
     <entry name="OutlineCloseButton" type = "Bool">
-        <default>true</default>
+        <default>false</default>
     </entry>
 
   </group>