[Time Conductor] Removed redundant getTimeSystem function

platform/features/conductor/core/src/ui/TimeConductorController.js

@@ -159,18 +159,6 @@ define(
             })[0];
         };
 
-        /**
-         * Given a key for a time system, retrieve the time system object.
-         * @private
-         * @param key
-         * @returns {TimeSystem}
-         */
-        TimeConductorController.prototype.getTimeSystem = function (key) {
-            return this.timeAPI.getAllTimeSystems().filter(function (timeSystem) {
-                return timeSystem.key === key;
-            })[0];
-        };
-
         /**
          * Activate the selected menu option. Menu options correspond to clocks.
          * A distinction is made to avoid confusion between the menu options and