Board scope weight dropdown doesn't render properly

Summary

When trying to set the Weight filter on a board scope, the dropdown does not render correctly. The values are narrower than the dropdown modal.

Steps to reproduce

  1. Create an Issue board
  2. Edit board
  3. Edit Weight

What is the current bug behavior?

image__1_

Output of checks

This bug happens on GitLab.com (GitLab Enterprise Edition 11.8.1-ee)

Browser: Google Chrome Version 71.0.3578.98