message: dont let placeholder show scrollbar when composer is narrow
diff: @@ -42,7 +42,7 @@ limitations under the License.
  white-space: pre-wrap;
  word-wrap: break-word;
  outline: none;
  - overflow-x: auto;
  + overflow-x: hidden;
  span.mx_UserPill, span.mx_RoomPill {
  padding-left: 21px;
  