Fix Monmouthshire collection new line error

[ffaen]

For Monmouthshire council, some collection date tags have new lines in them, therefore they must also be removed before parsing to check if the line starts with "Your next collection date is"

Just copied the text function from line 42, which already does this

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.93%. Comparing base (7b4b6eb) to head (450c608).
Report is 35 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1104   +/-   ##
=======================================
  Coverage   71.93%   71.93%           
=======================================
  Files           9        9           
  Lines        1037     1037           
=======================================
  Hits          746      746           
  Misses        291      291           

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