Allow cobrands to disable admin resending.

[dracos]

No description provided.

[codecov]

Codecov Report

Merging #2553 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2553      +/-   ##
==========================================
+ Coverage   82.35%   82.37%   +0.01%     
==========================================
  Files         211      211              
  Lines       13075    13077       +2     
  Branches     2415     2415              
==========================================
+ Hits        10768    10772       +4     
  Misses       1469     1469              
+ Partials      838      836       -2

Impacted Files	Coverage Δ
perllib/FixMyStreet/App/Controller/Admin.pm	81.09% <100%> (+0.21%)	⬆️
perllib/FixMyStreet/Cobrand/Bexley.pm	81.48% <100%> (+0.34%)	⬆️
perllib/Utils.pm	98.98% <0%> (+1.01%)	⬆️

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[struan]

This looks good although a test might be nice :)