Refactoring/rewrite of modal boxes handling

assets/js/src/Dropdown.js

@@ -2,6 +2,7 @@ Kanboard.Dropdown = function(app) {
     this.app = app;
 };
 
+// TODO: rewrite this code
 Kanboard.Dropdown.prototype.listen = function() {
     var self = this;
 
@@ -9,10 +10,6 @@ Kanboard.Dropdown.prototype.listen = function() {
         self.close();
     });
 
-    $(document).on('click', '#popover-content', function() {
-        self.close();
-    });
-
     $(document).on('click', '.dropdown-menu', function(e) {
         e.preventDefault();
         e.stopImmediatePropagation();
@@ -56,7 +53,3 @@ Kanboard.Dropdown.prototype.listen = function() {
 Kanboard.Dropdown.prototype.close = function() {
     $("#dropdown").remove();
 };
-
-Kanboard.Dropdown.prototype.onPopoverOpened = function() {
-    this.close();
-};