[web] Fit video tag to wrapper

Summary:
This diff solves the video tag fit problem. We could observe small gap between the wrapper and video tag:
{F642219}
Now video tags fit the wrapper:
{F642220}

Linear task: [ENG-4401](https://linear.app/comm/issue/ENG-4401/video-tag-doesnt-fit-the-container-completely)

Test Plan:
The best way to test this is to set `background-color: red` to wrapper tag using built-in inspection tool in your favorite browser and check if video tag covers wrapper completely.

Tested in Firefox, Chrome, and Safari.

Reviewers: bartek, tomek, inka, kamil

Reviewed By: inka

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D8525

web/media/media.css

@@ -20,6 +20,7 @@ span.multimedia > .multimediaImage > video {
   /* in multimedia.react.js */
   max-height: 200px;
   max-width: 100%;
+  display: inherit;
 }
 /* Prevent borders around images without src attribute */
 span.multimedia > .multimediaImage > img:not([src]) {