add default cases

mutes over 150 warnings on kde build environments
'enumeration value ´...´ not handled in switch [-Wswitch]'

Change-Id: Iefc8cd3bc820b1d8e039db6fc188533ceffb9d39
Reviewed-on: https://gerrit.libreoffice.org/29225
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Jochen Nitschke <j.nitschke+logerrit@ok.de>

vcl/unx/kde/salnativewidgets-kde.cxx

@@ -1559,6 +1559,8 @@ bool KDESalGraphics::getNativeControlRegion( ControlType nType, ControlPart nPar
             bReturn = true;
             }
             break;
+        default:
+            break;
         }
         break;
 
@@ -1610,6 +1612,9 @@ bool KDESalGraphics::getNativeControlRegion( ControlType nType, ControlPart nPar
             qRect.moveBy( qBoundingRect.left(), qBoundingRect.top() );
             bReturn = true;
             break;
+
+        default:
+            break;
         }
         break;
 
@@ -1638,6 +1643,9 @@ bool KDESalGraphics::getNativeControlRegion( ControlType nType, ControlPart nPar
             qRect.moveBy( qBoundingRect.left(), qBoundingRect.top() );
             bReturn = true;
             break;
+
+        default:
+            break;
         }
         break;
 
@@ -1701,8 +1709,12 @@ bool KDESalGraphics::getNativeControlRegion( ControlType nType, ControlPart nPar
 
             bReturn = true;
             break;
-        }
+        default:
             break;
+        }
+        break;
+    default:
+        break;
     }
 
     // Fill rNativeBoundingRegion and rNativeContentRegion