Use Qt 5's QStringList::join(QChar)

Less typing and less cycles than join(QString) where appropriate

Change-Id: I6ebc0e17e4d7fd9845864dd95b7de4ba4dad6906
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/help/remotehelpfilter.cpp

@@ -126,7 +126,7 @@ QByteArray RemoteHelpFilter::saveState() const
 {
     QByteArray value;
     QDataStream out(&value, QIODevice::WriteOnly);
-    out << m_remoteUrls.join(QLatin1String("^"));
+    out << m_remoteUrls.join(QLatin1Char('^'));
     out << shortcutString();
     out << isIncludedByDefault();
     return value;