Empty Modal Covers GlennBeck.com

[jonathansampson]

Test plan

#8391 (comment)

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• Did you search for similar issues before submitting this one?
  Yes

• Describe the issue you encountered:
  When ads are blocked, an empty modal covers glennbeck.com

• Platform (Win7, 8, 10? macOS? Linux distro?):
  Desktop

• Brave Version (revision SHA):

• Steps to reproduce:

  1. Navigate to an article
  2. After a couple of seconds, note the empty modal

• Actual result:
  The user has to manually dismiss the vestigial modal

• Expected result:
  The user's experience should not be interrupted by inexplicable elements

• Will the steps above reproduce in a fresh profile? If not what other info can be added?
  Yes

• Is this an issue in the currently released version?
  Yes

• Can this issue be consistently reproduced?
  Yes

• Screenshot if needed: