fix: remove non-Italian characters from Italian layout

[naveensingh]

Type of change(s)

• Bug fix
• Feature / enhancement
• Infrastructure / tooling (CI, build, deps, tests)
• Documentation

What changed and why

• Removed ¢, ¥, ß, á, æ, ç, í, ñ, ó, ø, ú popup characters
• Made è the default character when long pressing 3

Before & after preview

Closes the following issue(s)

• Closes Minor improvements to the Italian keyboard #251

Checklist

• I read the contribution guidelines.
• I manually tested my changes on device/emulator (if applicable).
• I updated the "Unreleased" section in CHANGELOG.md (if applicable).
• All checks are passing.