fix: Keyboard Shortcut to Make Text Bold Opens Bookmarks on Firefox.

[Srayash]

Proposed changes (including videos or screenshots)

When the Ctrl + b or Cmd + b shortcut is pressed, the event’s default behavior (opening the bookmarks sidebar) is prevented using event.preventDefault().

Issue(s)

fixes #34021

Steps to test or reproduce

1. Open RocketChat in Firefox.
2. Press cmd(or Ctrl) + b.

Further comments

[dionisio-bot]

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