Fix location map attribution rendering over message action bar (matrix-org#7974)

Author: t3chguy

res/css/views/messages/_MLocationBody.scss

@@ -18,6 +18,7 @@ limitations under the License.
  .mx_MLocationBody_map {
  width: 450px;
  height: 300px;
+ z-index: 0; // keeps the entire map under the message action bar
 
  border-radius: $timeline-image-border-radius;
  }