Fix build with GCC 12 (standard attributes in middle of decl-specifiers)

"virtual Q_REQUIRED_RESULT foo bar();" -> "Q_REQUIRED_RESULT virtual foo bar();"

(cherry picked from commit 5c37312c)

src/contact-editor/abstractcontacteditorwidget_p.h

@@ -54,7 +54,7 @@ public:
      */
     virtual void setReadOnly(bool readOnly) = 0;
 
-    virtual Q_REQUIRED_RESULT bool hasNoSavedData() const
+    Q_REQUIRED_RESULT virtual bool hasNoSavedData() const
     {
         return false;
     }