Removing some unused semicolons after Q_UNUSED

There were both variants, with and without extra semicolon.

src/plugins/cpptools/cppcurrentdocumentfilter.cpp

@@ -108,7 +108,7 @@ void CppCurrentDocumentFilter::accept(QuickOpen::FilterEntry selection) const
 
 void CppCurrentDocumentFilter::refresh(QFutureInterface<void> &future)
 {
-    Q_UNUSED(future);
+    Q_UNUSED(future)
 }
 
 void CppCurrentDocumentFilter::onDocumentUpdated(Document::Ptr doc)

src/plugins/cpptools/cppquickopenfilter.cpp

@@ -68,7 +68,7 @@ void CppQuickOpenFilter::onAboutToRemoveFiles(const QStringList &files)
 
 void CppQuickOpenFilter::refresh(QFutureInterface<void> &future)
 {
-    Q_UNUSED(future);
+    Q_UNUSED(future)
 }
 
 static bool compareLexigraphically(const QuickOpen::FilterEntry &a,

src/plugins/cpptools/cpptoolsplugin.cpp

@@ -198,8 +198,8 @@ CppToolsPlugin::~CppToolsPlugin()
 
 bool CppToolsPlugin::initialize(const QStringList &arguments, QString *error)
 {
-    Q_UNUSED(arguments);
-    Q_UNUSED(error);
+    Q_UNUSED(arguments)
+    Q_UNUSED(error)
     Core::ICore *core = Core::ICore::instance();
     Core::ActionManager *am = core->actionManager();