QUrl: add a missing std::move()

The deslashified QString can be moved into place here.

Found by Coverity.

Amends 5e936b6.

Pick-to: 6.9 6.8
Coverity-Id: 477475
Change-Id: Ibdaae0a9acae56960e16d5a6fd77fc1e08036af0
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Øystein Heskestad <oystein.heskestad@qt.io>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

Author: marcmutz

src/corelib/io/qurl.cpp

@@ -3390,7 +3390,7 @@ QUrl QUrl::fromLocalFile(const QString &localFile)
     // not directly using setPath here, as we do a few more transforms
     parseDecodedComponent(deslashified);
     if (!qt_urlRecode(url.d->path, deslashified, {}, localPathFromUser))
-        url.d->path = deslashified;
+        url.d->path = std::move(deslashified);
 
     return url;
 }