remove mistaken code comment

[skip ci]

routes/_components/compose/ComposeBox.html

@@ -65,11 +65,6 @@
      * the element doesn't take up the full width, and then set its left margin to
      * auto so that it sticks to the right. fit-content doesn't work in Edge, but
      * that just means that content that is level with the button is not clickable.
-     *
-     * Before this, I tried a wrapper element with pointer-events:none and then
-     * pointer-events:auto on the button itself, but in Chrome that made it so
-     * that occasionally hit detection failed and a click on the button would fall
-     * through and click something underneath, which is a worse bug.
      */
     width: -moz-fit-content;
     width: fit-content;