Use Utils::SkipEmptyParts instead of the deprecated one in QString

- Qt 5.14 introduced Qt::Keep/SkipEmptyParts and deprecated these in
QString namespace.
- Qt Creator defined Utils::SkipEmptyParts conditional on the Qt version,
so we use that for flexibility.
- Remove any explicit references to QString::KeepEmptyParts, as it's a
default value.

Change-Id: I72c65e4901ebc4c5422d4835e63fe23fb6ef28ff
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

plugins/fossil/wizard/fossiljsextension.cpp

@@ -59,7 +59,7 @@ void FossilJsExtension::parseArgOptions(const QStringList &args, QMap<QString, Q
     foreach (const QString &arg, args) {
         if (arg.isEmpty()) continue;
 
-        QStringList opt = arg.split('|', QString::KeepEmptyParts);
+        QStringList opt = arg.split('|'); //keep empty parts
         options.insert(opt[0], opt.size() > 1 ? opt[1] : QString());
     }
 }