Allow state editing via moderation.

[dracos]

If a state is passed in (on a cobrand), update problem state and add a comment to record this (as state changes are updates not moderations).

• Is new functionality tested? CodeCov will warn you about the diff coverage, but won’t complain about e.g. new files;
• Have you updated the changelog? If this is not necessary, put square brackets around this: skip changelog

[codecov]

Codecov Report

Merging #2381 into master will increase coverage by 0.02%.
The diff coverage is 85.71%.

@@            Coverage Diff            @@
##           master   #2381      +/-   ##
=========================================
+ Coverage   80.68%   80.7%   +0.02%     
=========================================
  Files         192     192              
  Lines       12314   12328      +14     
  Branches     2287    2293       +6     
=========================================
+ Hits         9935    9949      +14     
+ Misses       1613    1612       -1     
- Partials      766     767       +1

Impacted Files	Coverage Δ
perllib/FixMyStreet/App/Controller/Moderate.pm	89.88% <85.71%> (-0.38%)	⬇️
perllib/FixMyStreet/DB/Result/Comment.pm	88.6% <0%> (+2.53%)	⬆️

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[struan]

One small query but otherwise, this looks good.

[struan]

Normally this doesn't get made public so is that not going to be a bit unexpected?

[dracos]

Hmm, so this won't be on .com, only on a cobrand that's deliberately added state to the moderation form (like kiitc) where it's clearer it's a public editing, but yes, I guess it still might be odd. Guess I'll add a comment here at least about thinking about that for any other cobrand that might use it.