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/git/gerrit/gerritoptionspage.cpp

@@ -124,8 +124,8 @@ GerritParameters GerritOptionsWidget::parameters() const
                                  static_cast<unsigned short>(m_portSpinBox->value()),
                                  m_userLineEdit->text().trimmed(),
                                  GerritServer::Ssh);
-    result.ssh = m_sshChooser->path();
-    result.curl = m_curlChooser->path();
+    result.ssh = m_sshChooser->filePath().toString();
+    result.curl = m_curlChooser->filePath().toString();
     result.https = m_httpsCheckBox->isChecked();
     return result;
 }