Fix - Restrict privacy modification on media and album edit

[Intenzi]

Summary

Prevents updating privacy on single media and album edit requests when the privacy field is not available in the UI.

Changes

1. Single Media Edit (RTMediaTemplate::save_single_edit()):

   • Drops $_POST['privacy'] if editing group media, moderated media (privacy == 80) and when user privacy override is disabled.
   • Only includes privacy in $data_array if $_POST['privacy'] is present and allowed.
   • Reason: The frontend edit template hides the privacy dropdown for group media (which inherits group privacy) and moderated media (to prevent users from unflagging their own content). The backend accepts privacy unconditionally in POST requests presently.

2. Album Edit (RTMediaTemplate::save_album_edit()):

   • Removed privacy from $data_array and unsets $_POST['privacy'].
   • Reason: album-single-edit.php does not have a privacy field in the frontend. Submitting privacy in POST should not modify the album's privacy.

[rtBot]

Unable to PHPCS or SVG scan one or more files due to error running PHPCS/SVG scanner:

• app/main/controllers/template/RTMediaTemplate.php

The error may be temporary. If the error persists, please contact a human (commit-ID: 9751781).