[FIX] "Join Channel" button overlapping home bar on iPhone X/Xr/Xs/Max

[rudrankriyam]

@RocketChat/ios

Tiny fix - Safe Layout Guide in ChatPreviewModeView.

Closes #2628

[codecov]

Codecov Report

Merging #2629 into develop will decrease coverage by 0.17%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #2629      +/-   ##
===========================================
- Coverage    26.17%   25.99%   -0.18%     
===========================================
  Files          463      463              
  Lines        17224    17216       -8     
===========================================
- Hits          4509     4476      -33     
- Misses       12715    12740      +25

Impacted Files	Coverage Δ
...ntrollers/Chat/MessagesViewControllerJoining.swift	70.45% <100%> (ø)	⬆️
...anagers/Model/AuthManager/AuthManagerRecover.swift	36.36% <0%> (-60.61%)	⬇️
Rocket.Chat/Extensions/Models/AuthExtensions.swift	66.66% <0%> (-33.34%)	⬇️
...Chat/Models/Subscription/SubscriptionQueries.swift	70% <0%> (-30%)	⬇️
Rocket.Chat/Managers/PushManager.swift	24.13% <0%> (-10.35%)	⬇️
Rocket.Chat/Managers/AppManager.swift	36.04% <0%> (-4.07%)	⬇️
...Chat/Models/Mapping/SubscriptionModelMapping.swift	87.71% <0%> (-1.17%)	⬇️
...iews/Cells/Subscription/BaseSubscriptionCell.swift	0% <0%> (ø)	⬆️
...at/Views/Cells/Subscription/SubscriptionCell.swift	0% <0%> (ø)	⬆️
Rocket.Chat/Models/Subscription/Subscription.swift	48.88% <0%> (+2.08%)	⬆️
... and 3 more

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[SV8]

Very nice.

[rafaelks]

@snuff4 Thank you very much!!! :-)