Update allowed MQTT channel regex

[RickCarlino]

No description provided.

[codecov]

Codecov Report

Merging #919 into staging will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           staging   #919   +/-   ##
======================================
  Coverage      100%   100%           
======================================
  Files          221    221           
  Lines         3466   3466           
======================================
  Hits          3466   3466

Impacted Files	Coverage Δ
app/controllers/api/rmq_utils_controller.rb	100% <100%> (ø)	⬆️

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[coveralls]

Coverage remained the same at 92.079% when pulling ec58467 on RickCarlino:mqtt_updates into 60111d0 on FarmBot:staging.