Remove border-bottom from room topic (#9317)

It gives an empty room topic a height of 1px and does not seem to accomplish much else.

Signed-off-by: Arne Wilken [email protected]

Signed-off-by: Arne Wilken [email protected]

Author: Arnei

res/css/views/rooms/_RoomHeader.pcss

@@ -159,7 +159,6 @@ limitations under the License.
     font-size: $font-13px;
     line-height: $lineHeight;
     max-height: calc($lineHeight * $lines);
-    border-bottom: 1px solid transparent;
 
     /* to align baseline of topic with room name */
     margin: 4px 7px 0;