Fix mobile landscape grid

[timmydoza]

Contributing to Twilio

All third party contributors acknowledge that any contributions they provide will be made under the same open source license that the open source project is provided under.

• [x] I acknowledge that all my contributions will be made under the project's license.

Pull Request Details

JIRA link(s):

• N/A

Description

This PR fixes an issue with the landscape MobileGalleryView component where four participants were displayed as a 4x1 grid instead of a 2x2 grid. I also added tests for landscape MobileGalleryView and refactored the other tests. I removed the snapshot file as it would have been 900+ lines long with all the extra tests.

Burndown

Before review

• [ ] Updated CHANGELOG.md if necessary
• [x] Added unit tests if necessary
• [ ] Updated affected documentation
• [x] Verified locally with npm test
• [x] Manually sanity tested running locally
• [ ] Included screenshot as PR comment (if needed)
• [x] Ready for review

Before merge

• [ ] Got one or more +1s
• [ ] Re-tested if necessary