fix(react): inline overlays display contents consistently

[sean-perkins]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
  • Some docs updates need to be made in the ionic-docs repo, in a separate PR. See the contributing guide for details.
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Presenting an inline overlay multiple times in React will hide the overlay contents on the second+ open.

Issue URL: #26253

What is the new behavior?

• Adds the ion-delegate-host class to the React wrapper, so the additional element is not created
• Inline overlay contents are consistently displayed when presenting

Does this introduce a breaking change?

• Yes
• No

Other information

Testing these changes:

• Run the React test-app
• Visit the Keep Contents Mounted test suite
• Present a modal
• Observe: Contents load/display
• Dismiss modal
• Present modal again
• Observe: Contents should load/display consistently

Dev-build: 6.3.6-dev.11668017847.1d5c7dbd