fix: classloaderの呼び出しを変更2

src/main/kotlin/dev/usbharu/hideout/routing/UserRouting.kt

@@ -67,7 +67,7 @@ fun Application.user(userService: UserService, activityPubUserService: ActivityP
                     }
                 }
                 get("/{name}/icon.png"){
-                    call.respondBytes(javaClass.classLoader.getResourceAsStream("icon.png").readAllBytes(),ContentType.Image.PNG)
+                    call.respondBytes(String.javaClass.classLoader.getResourceAsStream("icon.png").readAllBytes(),ContentType.Image.PNG)
                 }
             }