fix onBackPressed deprecation of CardTemplateEditor

[Prince-kushwaha]

Purpose / Description

fix onBackPressed deprecation of CardTemplateEditor

Fixes

• For Handle "predictive back" / ActivityTransitionAnimation deprecation in API34 #14558

How Has This Been Tested?

Physical Device

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

[lukstbit]

This looks good.

One extra thing left over is a call in CardTemplateEditor's _onOptionsItemSelected()_method to the deprecated onBackPressed() that should be replaced with:

onBackPressedDispatcher.onBackPressed()

[david-allison]

Looks great, cheers!

[lukstbit]

LGTM, thanks for making the changes.