Add pointer-events: none to tooltips

Out tooltips often are covering other interactive elements on the page,
this allows interacting with those elements "through" the tooltip.
Without this hovering over our rows of edit buttons feels clunky.

backend/app/assets/stylesheets/spree/backend/plugins/_bootstrap_tooltip.scss

@@ -33,6 +33,8 @@
 }
 
 .tooltip {
+ pointer-events: none;
+
  &.action-edit, &.action-save, &.action-capture, &.action-add {
  @include bootstrap-tooltip-color($brand-success);
  }