Gerrit dialog uses wrong repository

1. Start Creator.
2. Open a file from a git repository with a Gerrit remote.
3. Open the dialog from "Tools" -> "Git" -> "Remote Repository" -> "Gerrit..."
   In the top left corner, the dialog displays the repository of the file.
4. Close the dialog.
5. Open a file from a different git repository with a Gerrit remote.
6. Open the dialog from "Tools" -> "Git" -> "Remote Repository" -> "Gerrit..." again.
   In the top left corner, the dialog still displays the repository of the first file. Checkouts and cherry-picks will be done in the wrong directory.
7. Open the dialog from "Tools" -> "Git" -> "Local Repository" -> "Branches..."
   This dialog displays the correct repository.
   To change the repository used by the Gerrit dialog, you'll need to restart Creator.

In any situation, all git-related dialogs should use the same repository. This should be chosen depending on the currently open projects and files.