Utils: Port some FilePath part accessors to QStringView

Change-Id: Ib5cc262e44c73880b6538eed714365e3d685870a
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/libs/qmljs/qmljsmodelmanagerinterface.cpp

@@ -1213,7 +1213,7 @@ static QList<Utils::FilePath> minimalPrefixPaths(const QList<Utils::FilePath> &p
     // find minimal prefix, ensure '/' at end
     for (Utils::FilePath path : qAsConst(paths)) {
         if (!path.endsWith("/"))
-            path.setPath(path.path() + "/");
+            path.setPath(QString(path.path() + "/"));
         if (path.path().length() > 1)
             sortedPaths.append(path);
     }