fix(lockedItems): Properly unlock locked items when lock conditions change

Previously when the lock expression value changes from true to false the locked value was not removed from the locked list.

Closes #1824

Author: jasonthomasgray

src/uiSelectController.js

@@ -430,7 +430,7 @@ uis.controller('uiSelectCtrl',
             ctrl.close(skipFocusser);
             return;
           }
-        }        
+        }
         _resetSearchInput();
         $scope.$broadcast('uis:select', item);
 
@@ -506,7 +506,7 @@ uis.controller('uiSelectCtrl',
         }
 
       if (!isLocked && lockedItemIndex > -1) {
-        lockedItems.splice(lockedItemIndex, 0);
+        lockedItems.splice(lockedItemIndex, 1);
       }
     }