[FIX] Fixed bugs on Theming that was causing the Subscriptions cells to not be applied

[rafaelks]

@RocketChat/ios

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@08a1fe9). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff             @@
##             develop    #2352   +/-   ##
==========================================
  Coverage           ?   26.03%           
==========================================
  Files              ?      440           
  Lines              ?    16447           
  Branches           ?        0           
==========================================
  Hits               ?     4282           
  Misses             ?    12165           
  Partials           ?        0

Impacted Files	Coverage Δ
Rocket.Chat/Theme/ThemeableViews.swift	56.31% <ø> (ø)
...at/Views/Cells/Subscription/SubscriptionCell.swift	0% <0%> (ø)

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