Cleanup: fixed some warnings

[tejasM17]

Description

in kay picker, never used parameter, redundant qualifier and some grammar

Fixes

• Fixes [Cleanup]: Fix Android Studio Warnings #13282

Approach

address android studio warning in KeyPicker, removed unused parameters,
improve readability, miner grammar in comments, confirmed no changes to dispatchKeyEvent logic

How Has This Been Tested?

build inside studio On-device integration tests
key selection still working, selected key updates ui, no fault observed

Checklist

• 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