message: move timestamp to the right in thread's context
diff: @@ -732,6 +732,11 @@ $hover-select-border: 4px;
  margin-top: 0;
  padding-bottom: 5px;
  margin-bottom: 5px;
  +
  + .mx_MessageTimestamp {
  + left: auto;
  + right: 0;
  + }
  }
  .mx_MessageComposer_sendMessage {
  