Gerrit: Remove repo selection from the dialog

Behave like the Branches dialog, which is updated by the current open file.

Change-Id: Id106b3e4fa777bcbf08b826f4e7d52845dde57a6
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/git/gerrit/gerritplugin.h

@@ -42,6 +42,8 @@ class Command;
 class CommandLocator;
 }
 
+namespace VcsBase { class VcsBasePluginState; }
+
 namespace Gerrit {
 namespace Internal {
 
@@ -64,7 +66,7 @@ public:
     void addToLocator(Core::CommandLocator *locator);
     void push(const QString &topLevel);
 
-    void updateActions(bool hasTopLevel);
+    void updateActions(const VcsBase::VcsBasePluginState &state);
 
 signals:
     void fetchStarted(const QSharedPointer<Gerrit::Internal::GerritChange> &change);