[FIX] Shrug missing backslash character

[hugocostadev]

Proposed changes (including videos or screenshots)

Previously the escape character \ was escaping everything.

To avoid unexpected text formatting errors it was restricted to only escape curtains chars like: * _ ~ ` # .
Doing so the Shrug had to change in the code to display the correct ASCII Art

Issue(s)

closes #26907
closes #26800

Steps to reproduce:

1. Create a message using /shrug.

Expected behavior:

The kaomoji being rendered looks as follows: ¯\_(ツ)_/¯

Actual behavior:

The kaomoji is missing an arm: ¯_(ツ)_/¯

Further comments

The Shrug issue will be fixed after this Pull Request and RocketChat/fuselage#899 are released

TC-99

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[gabriellsh]