[web] Hide reply tooltip button for multimedia

Summary:
Just took a second to change this, we don't want to check whether the message is composable since that includes both text and multimedia. Now, if the message is not text we will not show the tooltip icon.

Resolves https://linear.app/comm/issue/ENG-4520/reply-button-appears-for-images-on-web

Test Plan:
See below and after to verify that the reply button no longer shows for multimedia

Before:

After:

Reviewers: atul, ginsu

Reviewed By: atul, ginsu

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D8766