[CHORE] Remove @ from file attachments, autocomplete & quotes

[rafaelks]

@RocketChat/ios

[codecov]

Codecov Report

Merging #2521 into develop will decrease coverage by 0.1%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop    #2521      +/-   ##
===========================================
- Coverage     26.6%   26.49%   -0.11%     
===========================================
  Files          456      456              
  Lines        16863    16928      +65     
===========================================
- Hits          4486     4485       -1     
- Misses       12377    12443      +66

Impacted Files	Coverage Δ
...t.Chat/Views/Subscriptions/FileTableViewCell.swift	0% <0%> (ø)	⬆️
.../Chat/MessagesViewControllerComposerDelegate.swift	0% <0%> (ø)	⬆️
...Chat/Models/Mapping/SubscriptionModelMapping.swift	87.5% <0%> (-0.22%)	⬇️
Rocket.Chat/Views/Cells/Chat/ChatMessageCell.swift	0% <0%> (ø)	⬆️
...at/Models/Subscription/UnmanagedSubscription.swift	0% <0%> (ø)	⬆️
...hat/Views/Cells/Hints/UserHintAvatarViewCell.swift	0% <0%> (ø)	⬆️
Rocket.Chat/Theme/ThemeableViews.swift	51.94% <0%> (ø)	⬆️
...Chat/Views/Cells/Hints/TextHintEmojiViewCell.swift	0% <0%> (ø)	⬆️
...ket.Chat/Views/Cells/Hints/TextHintLabelCell.swift	0% <0%> (ø)	⬆️
...ews/Chat/New Chat/Cells/BaseQuoteMessageCell.swift	0% <0%> (ø)	⬆️
... and 12 more

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