QMimeDatabase::mimeTypeForUrl: skip content check for remote URLs

The code was trying to open a local file with the same path
as the remote URL, which is unnecessary and wrong in the unlikely
case where such a file would exist.

Spotted by Christoph Feck when reading the code.

Change-Id: I1d77e5781cf606b025d2877f48a9914dd1e36b1d
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>

src/corelib/mimetypes/qmimedatabase.cpp

@@ -526,7 +526,7 @@ QMimeType QMimeDatabase::mimeTypeForUrl(const QUrl &url) const
     if (scheme.startsWith(QLatin1String("http")) || scheme == QLatin1String("mailto"))
         return mimeTypeForName(d->defaultMimeType());
 
-    return mimeTypeForFile(url.path());
+    return mimeTypeForFile(url.path(), MatchExtension);
 }
 
 /*!