Add editable reply-status dropdown in form-reply.php for moderators when editing replies

[netweb]

Add editable 'reply-status' dropdown in form-reply.php for moderators when editing replies.

bbp_form_reply_status_dropdown was added in r5399/#2463

The 'reply to' dropdown was added in r5396 to form-reply.php

[johnjamesjacoby]

In 5495:

Add reply status section to form-reply.php. Props netweb. Fixes #2644.

[johnjamesjacoby]

In 7255:

Topic/Reply: improvements to status updates.

This change includes 2 fixes:

• Prefer $topic_id over $topic->ID, and use it (instead of $forum_id) when checking for moderation capability
• Add missing logic in bbp_edit_reply_handler() that was preventing statuses from saving as intended

See #2644.

In branches/2.6, for 2.6.10.