[Oxfordshire] Send additional email on category

[MorayMySoc]

Oxfordshire would like the category 'Trees obscuring street lights' to send an additional email as well as being sent over open311.

https://mysocietysupport.freshdesk.com/a/tickets/4741

[skip changelog]

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 82.27%. Comparing base (e84e4a6) to head (f340307).
Report is 38 commits behind head on master.

Files with missing lines	Patch %	Lines
perllib/FixMyStreet/Cobrand/Oxfordshire.pm	75.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5264      +/-   ##
==========================================
- Coverage   82.42%   82.27%   -0.15%     
==========================================
  Files         409      412       +3     
  Lines       32098    32413     +315     
  Branches     5127     5187      +60     
==========================================
+ Hits        26456    26669     +213     
- Misses       4129     4200      +71     
- Partials     1513     1544      +31     

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