fix grammar

src/gaea.app/src/main/kotlin/com/synebula/gaea/app/cmd/ICommandApp.kt

@@ -21,12 +21,10 @@ interface ICommandApp<TCommand : ICommand, TKey> : IApplication {
 
     var service: IService<TKey>
 
-
     @PostMapping
     @MethodName("添加")
     fun add(@RequestBody command: TCommand): HttpMessage {
-        val msg = HttpMessage(this.service.add(command))
-        return msg
+        return HttpMessage(service.add(command))
     }
 
     @PutMapping("/{id:.+}")
@@ -36,7 +34,6 @@ interface ICommandApp<TCommand : ICommand, TKey> : IApplication {
         return HttpMessage()
     }
 
-
     @DeleteMapping("/{id:.+}")
     @MethodName("删除")
     fun remove(@PathVariable id: TKey): HttpMessage {