Revert "Code model: Update on changes from the versioning system."

This reverts commit 7aa2411693.
It breaks the code model updates completely. So reverting this change
until we have the right thing.

Reviewed-by: Roberto Raggi

src/plugins/git/gitcommand.cpp

@@ -177,8 +177,6 @@ void GitCommand::run()
         emit errorText(error);
 
     emit finished(ok, m_cookie);
-    if (ok)
-        emit success();
     // As it is used asynchronously, we need to delete ourselves
     this->deleteLater();
 }