Mirror selection dropdown clipped in the clone repository inline dialog

Issue Summary

The mirror selection dropdown is clipped in the Clone repository inline dialog.

Steps to Reproduce

1. Setup the Bitbucket DC instance to have multiple mirrors
2. Navigate to a repository
3. Click Clone in the side navigation
4. Open the 'Clone from' dropdown

Expected Results

All mirror options are fully shown.

Actual Results

The mirror options are clipped within the boundaries of the Clone inline dialog.

Workaround

Use keyboard navigation to access other mirrors in the list if they are not visible.