Utils: Replace FileChooser::path() by filePath().toString()

Keep the old method for now to ease downstream porting.

The change is kept mechanical, there's a lot of cleanup possible now
on the user code side.

Change-Id: I936baedd45b7ba057f1c789a1bec896886f48eff
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/mercurial/srcdestdialog.cpp

@@ -86,7 +86,7 @@ QString SrcDestDialog::getRepositoryString() const
         return repoUrl.toString();
     }
     if (m_ui->localButton->isChecked())
-        return m_ui->localPathChooser->path();
+        return m_ui->localPathChooser->filePath().toString();
     return m_ui->urlLineEdit->text();
 }