fix(shifts): added Promise to remove function of the shift controller

src/time-and-attendance/time-tracker/shifts/controllers/shift.controller.ts

@@ -28,7 +28,7 @@ export class ShiftController {
     }
 
     @Delete(':shift_id')
-    remove(@Param('shift_id') shift_id: number ) {
+    remove(@Param('shift_id') shift_id: number ): Promise<Result<number, string>> {
         return this.update_delete_service.deleteShift(shift_id);
     }