[kstyle]: Fix FTBFS

kstyle/breezetoolsareamanager.cpp

@@ -64,7 +64,7 @@ namespace Breeze {
             }
         }
 
-        if (itemHeight == 0 && !window->property(PropertyNames::noSeparator) {
+        if (itemHeight == 0 && !(window->property(PropertyNames::noSeparator).toBool())) {
             auto win = const_cast<QMainWindow*>(window);
             win->setContentsMargins(0, 1, 0, 0);
         } else {