Simplify code

mirai-demos/mirai-demo-gentleman/src/main/kotlin/demo/gentleman/Main.kt

@@ -132,8 +132,7 @@ suspend fun main() {
         }
 
         has<Image> {
-            if (this is FriendMessage || (this is GroupMessage && this.permission == MemberPermission.ADMINISTRATOR)) {
-                withContext(IO) {
+            if (this is FriendMessage || (this is GroupMessage && this.permission == MemberPermission.ADMINISTRATOR)) withContext(IO) {
                 val image: Image by message
                 // 等同于 val image = message[Image]
 
@@ -145,7 +144,7 @@ suspend fun main() {
                     reply(e.message ?: e::class.java.simpleName)
                 }
             }
-            }
+
         }
 
         startsWith("上传图片", removePrefix = true) handler@{