Remove space in div class name in filter form

[johannaengland]

A little fix to #2981 that I found while comparing the html of old and new filter forms.
Before it was <div id="div_id_net_type" class="ctrlHolder "> and now it is <div id="div_id_net_type" class="ctrlHolder">

Not sure if it actually makes a difference?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.58%. Comparing base (c5dfce2) to head (aa0a8cb).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2992   +/-   ##
=======================================
  Coverage   56.58%   56.58%           
=======================================
  Files         602      602           
  Lines       43729    43729           
  Branches       48       48           
=======================================
  Hits        24744    24744           
  Misses      18973    18973           
  Partials       12       12           

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[lunkwill42]

It shouldn't make a lick of difference to an HTML parser, but it looks tidier for humans this way :)