fix(ui): missing conversions of boolean to string in outgoing notify schemas

[JosephKav]

• fix typo of gotify params.useheader so it will now be set

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.83%. Comparing base (70c9f5b) to head (6588ce6).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #758   +/-   ##
=======================================
  Coverage   98.83%   98.83%           
=======================================
  Files         132      132           
  Lines        8906     8906           
=======================================
  Hits         8801     8801           
  Misses         80       80           
  Partials       25       25           

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