Remove unneeded button spacing override

client/src/components/Draftail/Tooltip/Tooltip.scss

@@ -84,8 +84,4 @@ $tooltip-z-index: $draftail-tooltip-z-index;
 
 .Tooltip__button {
     padding: $button-spacing $controls-spacing;
-
-    + .Tooltip__button {
-        margin-left: $button-spacing;
-    }
 }

client/src/components/Draftail/blocks/MediaBlock.js

@@ -40,6 +40,7 @@ class MediaBlock extends Component {
     const trigger = e.target;
 
     this.setState({
+      // Warning: overriding native DOM object. Proceed with caution.
       showTooltipAt: Object.assign(trigger.getBoundingClientRect(), {
         containerWidth: trigger.parentNode.offsetWidth,
       }),