fix(swipe-back): gesture rtl setting is reactive

[liamdebeasi]

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?

Issue URL: resolves #26794

The RTL setting is checked on creation of the swipe-back gesture. This means that if a user's text direction changes mid-session (such as by changing a locale on the phone) then the swipe back gesture will potentially run in the wrong direction. For example, if the text direction was LTR on load, the swipe back gesture will run from left to run even when the text direction is updated to RTL.

What is the new behavior?

• The RTL setting is checked at the beginning of every swipe gesture

Does this introduce a breaking change?

• Yes
• No

Other information

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