VCS: Remove "Commit" option when closing commit editor

Fixes: QTCREATORBUG-22233
Change-Id: I1270cc58a823b919475fc51ac5fc71b892b379b6
Reviewed-by: André Hartmann <aha_1980@gmx.de>

src/plugins/git/gitplugin.cpp

@@ -252,7 +252,6 @@ public:
     void updateActions(VcsBasePluginPrivate::ActionState) override;
     bool submitEditorAboutToClose() override;
     void discardCommit() override { cleanCommitMessageFile(); }
-    bool canCommitOnFailure() const override { return false; }
 
     void diffCurrentFile();
     void diffCurrentProject();