[Flags] Selective tag pemission

[imorland]

Bug Report

Current Behavior If a user has permission to view flags in some tags, but not others, details of a flag within a tag with no permission are still displayed in the flags notification dropdown. Note: I do not have permission to view flags in the example discussion

Screenshots

Environment

• Flarum version: 1.0.2
• Website URL: http://discuss.flarum.org
• Webserver: [e.g. apache, nginx]
• Hosting environment: [e.g. shared, vps]
• PHP version: x.y.z
• Browser: [e.g. chrome 67, safari 11]

Output of "php flarum info", run this in terminal in your Flarum directory.

Possible Solution I'll see about putting a PR together ;)