Fix double encoding of per-category templates.

[dracos]

Fixes https://github.com/mysociety/fixmystreet-commercial/issues/1917

[codecov]

Codecov Report

Merging #3058 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3058   +/-   ##
=======================================
  Coverage   83.16%   83.16%           
=======================================
  Files         246      246           
  Lines       15446    15446           
  Branches     2883     2883           
=======================================
  Hits        12845    12845           
  Misses       1689     1689           
  Partials      912      912           

Impacted Files	Coverage Δ
perllib/FixMyStreet/Roles/ContactExtra.pm	100.00% <100.00%> (ø)

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[chrismytton]

I still can't seem to reproduce this issue 😕

When I visit https://report.highwaysengland.co.uk/report/2148215 and pick a response template I see this:

That doesn't appear to be double encoded to me, unless I'm misunderstanding? Perhaps there's a difference between Mac and Windows?

[dracos]

It only happens in the inspect form update form, not the main column update form. (As that form is getting its per-category template data from a hidden data field.)

[chrismytton]

It only happens in the inspect form update form, not the main column update form. (As that form is getting its per-category template data from a hidden data field.)

Ah yep, I see now!

[chrismytton]

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