Focus on the interface picker when the List View appears

[brunokoga]

Fixes the annoying bug that the interface picker is not focused after you tap Add on the Watch.

[diogot-bot]

	1 Warning
:warning:	Total coverage less than 80%

	1 Message
:book:	Executed 12 tests, with 0 failures (0 unexpected) in 1.014 (1.023) seconds

Generated by :no_entry_sign: Danger

[codecov-io]

Codecov Report

Merging #141 into development will decrease coverage by 4.45%. The diff coverage is 0%.

@@               Coverage Diff               @@
##           development     #141      +/-   ##
===============================================
- Coverage        68.71%   64.26%   -4.46%     
===============================================
  Files               33       49      +16     
  Lines             1592     2446     +854     
  Branches             0       46      +46     
===============================================
+ Hits              1094     1572     +478     
- Misses             498      873     +375     
- Partials             0        1       +1

Impacted Files	Coverage Δ
...ddInterfaceController/AddInterfaceController.swift	0% <0%> (ø)
MyWeight/AppDelegate.swift	59.25% <0%> (-5.96%)	:arrow_down:
MyWeight/Views/TableViewCell.swift	76.92% <0%> (-4.9%)	:arrow_down:
MyWeight/Views/TintButton.swift	87.5% <0%> (-2.98%)	:arrow_down:
MyWeight/Views/GradientView.swift	40% <0%> (-2.86%)	:arrow_down:
MyWeight/Views/ClearButton.swift	88.46% <0%> (-2.85%)	:arrow_down:
MyWeight/Services/MassService.swift	48.48% <0%> (-2.63%)	:arrow_down:
MyWeight/Screens/Add/AddViewController.swift	64.28% <0%> (-2.39%)	:arrow_down:
...uthorizationRequest/AuthorizationRequestView.swift	76.66% <0%> (-2.09%)	:arrow_down:
...eens/AccessDenied/AccessDeniedViewController.swift	71.42% <0%> (-1.91%)	:arrow_down:
... and 40 more

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