MDL-83493 theme_boost: Fix popover triggering

Popovers were not being closed when clicking elsewhere resulting in
multiple popovers open at the same time that cannot be closed. That
was happening because the trigger for popovers was set to "focus" and
"click" at the same time. This patch removes the "click" as trigger.
Also, adds the click event listener to show the popover and avoid the
problem described in MDL-82570, that caused this regression.

theme/boost/amd/src/loader.js

@@ -58,7 +58,7 @@ const enablePopovers = () => {
     $('body').popover({
         container: 'body',
         selector: '[data-toggle="popover"]',
-        trigger: 'focus click',
+        trigger: 'focus',
         whitelist: Object.assign(DefaultWhitelist, {
             table: [],
             thead: [],
@@ -77,6 +77,9 @@ const enablePopovers = () => {
             $(e.target).popover('show');
         }
     });
+    document.addEventListener('click', e => {
+        $(e.target).closest('[data-toggle="popover"]').popover('show');
+    });
 };
 
 /**