Gerrit: Update remotes on settings change

If the user is changed, we need to refresh at least the fallback server.

Task-number: QTCREATORBUG-20536
Change-Id: If21830ae5607907db9aaee164bc85b971ff93010
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/git/gerrit/gerritoptionspage.cpp

@@ -72,6 +72,7 @@ void GerritOptionsPage::apply()
                 newParameters.setPortFlagBySshType();
             *m_parameters = newParameters;
             m_parameters->toSettings(Core::ICore::settings());
+            emit settingsChanged();
         }
     }
 }