[FIX][REGRESSION] Slash commands not working

[cardoso]

@RocketChat/ios

Closes #2447

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@932f7ea). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff             @@
##             develop    #2449   +/-   ##
==========================================
  Coverage           ?   25.96%           
==========================================
  Files              ?      448           
  Lines              ?    16831           
  Branches           ?        0           
==========================================
  Hits               ?     4371           
  Misses             ?    12460           
  Partials           ?        0

Impacted Files	Coverage Δ
...cket.Chat/Controllers/Chat/MessagesViewModel.swift	32.64% <0%> (ø)

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[rafaelks]

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