[PLT-7001] Fix extra whitespace between search bar and "@" icon in channel header after expanding the right-hand side (#6891)

* fix extra whitespace between search bar and "@" icon in channel header after expanding the right-hand side

* remove .search__form class

webapp/sass/components/_webrtc.scss

@@ -328,9 +328,4 @@
     #videos.small {
         position: relative;
     }
-
-    .search__form {
-        margin-left: 5px;
-        width: calc(100% - 80px);
-    }
 }