Removing some unused semicolons after Q_UNUSED

There were both variants, with and without extra semicolon.

src/plugins/help/helpplugin.cpp

@@ -135,8 +135,8 @@ HelpPlugin::~HelpPlugin()
 
 bool HelpPlugin::initialize(const QStringList &arguments, QString *error)
 {
-    Q_UNUSED(arguments);
-    Q_UNUSED(error);
+    Q_UNUSED(arguments)
+    Q_UNUSED(error)
     m_core = Core::ICore::instance();
     QList<int> globalcontext;
     globalcontext << Core::Constants::C_GLOBAL_ID;