Stop Bluetooth service fix #1093

[atrovato]

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Description of change

Fix Bluetooth stop method to disable / unlink it.

[codecov]

Codecov Report

Merging #1097 (835295b) into master (537be24) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1097   +/-   ##
=======================================
  Coverage   95.55%   95.56%           
=======================================
  Files         531      531           
  Lines        7112     7123   +11     
=======================================
+ Hits         6796     6807   +11     
  Misses        316      316           

Impacted Files	Coverage Δ
...ices/bluetooth/lib/commands/bluetooth.getStatus.js	100.00% <100.00%> (ø)
.../services/bluetooth/lib/commands/bluetooth.scan.js	91.89% <100.00%> (ø)
.../services/bluetooth/lib/commands/bluetooth.stop.js	100.00% <100.00%> (ø)
server/services/bluetooth/lib/index.js	100.00% <100.00%> (ø)

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[cicoub13]

OK for me 👍

In server/services/bluetooth/lib/commands/bluetooth.stop.js, I prefer to use null rather than undefined, but I think it's more a preference and not a rule in Gladys (eslint allows it).