Fix fontsproto split by keeping headers in main package

[BHAVISHYA2005]

Fix fontsproto split by keeping headers in main package

Fixes: #44859

Related: None

Pre-review Checklist

For new package PRs only

For new version streams

For package updates (renames) in the base images

For security-related PRs

For version bump PRs

For PRs that add patches

General Checklist Items Relevant to This PR

• Changes are tested and verified (Tested in a Wolfi container—headers now stay in fontsproto)
• Commit message follows guidelines (e.g., "Fix fontsproto split: move to packages/, keep headers in main, update .gitignore (suspiciously empty - fontsproto #44859)")
• Documentation updated (if applicable - none needed here)

Description

Fixes #44859. Added contents to keep headers (e.g., FS.h, fontproto.h) in the main package instead of being moved to fontsproto-dev by split/dev. . Tested in a Wolfi container— & confirmed headers now stay in the fontsproto package