Fix #1808, Fix #1809: Fix tipping screen rotation & multitasking layout

[kylehickinson]

In iOS 13, traitCollectionDidChange no longer is called on init and instead is given a predicted trait collection therefore we need to make sure to use that predicted trait collection on init in case it never changes.

Summary of Changes

This pull request fixes issue #1808
This pull request fixes issue #1809

Submitter Checklist:

• Unit Tests are updated to cover new or changed functionality
• User-facing strings use NSLocalizableString()

Reviewer Checklist:

• Issues include necessary QA labels:
  • QA/(Yes|No)
  • release-notes/(include|exclude)
  • bug / enhancement
• Necessary security reviews have taken place.
• Adequate unit test coverage exists to prevent regressions.
• Adequate test plan exists for QA to validate (if applicable).
• Issue is assigned to a milestone (should happen at merge time).