Debugger: Fix go to location on interrupt

Avoid checking an invalid QUrl - instead restore
old code of always creating one an verifying this
instead.
Remove the now unused FilePath::isLocal().

Change-Id: I037c43e6fbdb7dc1f8901fc70b581f3c94ab503a
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/fileutils.h

@@ -101,7 +101,6 @@ public:
     bool startsWith(const QString &s) const;
     bool endsWith(const QString &s) const;
 
-    bool isLocal() const;
     bool isDir() const;
     bool isNewerThan(const QDateTime &timeStamp) const;