[BUG] New DMs after searching user are not getting created via API

[rafaelks]

@RocketChat/ios

Closes #2437
Closes #2544

[codecov]

Codecov Report

Merging #2546 into develop will increase coverage by 0.05%.
The diff coverage is 35.29%.

@@             Coverage Diff             @@
##           develop    #2546      +/-   ##
===========================================
+ Coverage    26.44%   26.49%   +0.05%     
===========================================
  Files          456      456              
  Lines        16878    16903      +25     
===========================================
+ Hits          4463     4479      +16     
- Misses       12415    12424       +9

Impacted Files	Coverage Δ
...ubscriptionsList/SubscriptionsViewController.swift	2.47% <ø> (ø)	⬆️
...t.Chat/Models/Subscription/SubscriptionUtils.swift	33.75% <0%> (-0.43%)	⬇️
Rocket.Chat/Models/Subscription/Subscription.swift	47.61% <0%> (-2.39%)	⬇️
...Chat/Controllers/Chat/MessagesViewController.swift	34.25% <50%> (+3.64%)	⬆️

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