fix: instant note editor tap mode inconsistency

[criticalAY]

Purpose / Description

The note editor mode from view model was not used instead a var from the activity class was used, this PR handles the editor mode via ViewModel and sets the views

Approach

Use mode from view model only

How Has This Been Tested?

before:
Screen_recording_20250208_032036.webm

after:
Screen_recording_20250208_031955.webm

Checklist

Please, go through these checks before submitting the PR.

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[criticalAY]

@mikehardy might be cache or its flaky: https://github.com/ankidroid/Anki-Android/actions/runs/13208648591/job/36877639695?pr=17936

[mikehardy]

@criticalAY yep that's about the only flake at the moment, it's logged (and then I logged a dupe recently even, oops)

[criticalAY]

Flaky test