Push mirror pushes tags although "only protected branches" selected
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### Summary
When using the "push-mirror" functionality, gitlab pushes tags although the "Only mirror protected branches" checkbox has been selected.
### Steps to reproduce
1. create source and destination repositories (e.g. https://gitlab.com/ensc/test-mirror-src + https://gitlab.com/ensc/test-mirror-dst) and configure mirroring from `src` to `dst`. Select

2. Work in `src`
3. Create a tag in `src`
4. Work in `src`
5. Configure `dst` that every tag (`*`) is protected and that nobody can create them
6. repeat 3+4
### What is the current *bug* behavior?
- the tag created by 3. exists in `dst`
- after 5. mirroring fails with

### What is the expected *correct* behavior?
- only the (protected) `master` branch is in the `dst` repo, no tags
- mirroring succeeds after 5.
issue