Fixes task left in odd setting when cancelling editing with ESC / Escape Key; add click outside to close modal #8308 #8321 (#8382)

* Remove backdrop property from open modal call to allow click-outside to close, call cancelTaskEdit function on dismissal of edit modal via ESC or click-outside

* Remove commented out code, change catch function to normal (non-arrow)

* Modify task services test mock openModal function, to handle new use of subsequent promise resolution functionality

* Tidy old edit controls away

test/client-old/spec/services/taskServicesSpec.js

@@ -17,7 +17,14 @@ describe('Tasks Service', function() {
       tasks = Tasks;
     });
 
-    rootScope.openModal = function () {};
+    rootScope.openModal = function() {
+      return {
+        result: {
+          then: function() {},
+          catch: function() {},
+        },
+      };
+    };
   });
 
   it('calls get user tasks endpoint', function() {