fix: use consistent label for Whiteboard editor in "App bar buttons" page

[snowtimeglass]

Purpose / Description

Fix discrepancy in the labels for "Whiteboard editor" option

Fixes

• N/A

Approach

• Use the same string with Reviewer, in App bar settings page
• Remove the unused string, Whiteboard pen color

How Has This Been Tested?

Checked in physical device (Android 11)

Record_2025-02-07-13-35-58_7b5228b5a93c00ecba98ecb0735c59e2.mp4

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

[github-actions]

Important

Maintainers: This PR contains Strings changes

1. Sync Translations before merging this PR and wait for the action to complete
2. Review and merge the auto-generated PR in order to sync all user-submitted translations
3. Sync Translations again and merge the PR so the huge automated string changes caused by merging this PR are by themselves and easy to review

[github-actions]

Maintainers: Please Sync Translations to produce a commit with only the automated changes from this PR.

Read more about updating strings on the wiki,

• localization-administration
• download-localized-strings