message: fix missing rounded corners on blurhash placeholder
diff: @@ -14,6 +14,8 @@ See the License for the specific language governing permissions and
  limitations under the License.
  */
  +$timelineImageBorderRadius: 4px;
  +
  .mx_MImageBody {
  display: block;
  margin-right: 34px;
  @@ -25,7 +27,11 @@ limitations under the License.
  height: 100%;
  left: 0;
  top: 0;
  - border-radius: 4px;
  + border-radius: $timelineImageBorderRadius;
  +
  + > canvas {
  + border-radius: $timelineImageBorderRadius;
  + }
  }
  .mx_MImageBody_thumbnail_container {
  