Fix tr-context in quickfix.

Change-Id: Idf741c0eb77dad6f2893f4dff45a8455d3ce9289
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/plugins/cppeditor/cppquickfixes.cpp

@@ -3382,8 +3382,7 @@ public:
         , m_signalName(signalName)
         , m_storageName(storageName)
     {
-        QString desc = InsertQtPropertyMembers::tr("Generate Missing Q_PROPERTY Members...");
-        setDescription(desc);
+        setDescription(QuickFixFactory::tr("Generate Missing Q_PROPERTY Members..."));
     }
 
     void perform()