Rename note_editor.xml to note_editor_fragment.xml

[Haz3-jolt]

Purpose / Description

• Minor Refactor needed for Refactor NoteEditor to use a AnkiActivity instead of SingleFragmentActivity #18836

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

[sanjaysargam]

LGTM 🚀