Use const instead of let

Use property shorthand

Manual push by LingoHub User: Gabriel Engel.
Project: Rocket.Chat

Made with  by https://lingohub.com

In .rename, having both name and roomName parameters would be confusing.

Also:
Sync groups.close error message with channels.close
Sync and fix error message in groups.open that was using a parameter that
couldn't be there before this patch.
Extract the bodyParams/queryParams logic.

Manual push by LingoHub User: Gabriel Engel.
Project: Rocket.Chat

Made with  by https://lingohub.com

[FIX] make channels.create API check for create-c

Old mistake rewriting code.

This prevent invalid XML:
Element {urn:oasis:names:tc:SAML:2.0:metadata}KeyDescriptor: Missing child element(s). Expected is ( {http://www.w3.org/2000/09/xmldsig#}KeyInfo )
(see https://www.samltool.com/validate_xml.php)

and improve code style

[Fix] Error when trying to show preview of undefined filetype

and some small fixes