Fix doesn't send file message after file uploading (#637)

mirai-api-http/src/main/kotlin/net/mamoe/mirai/api/http/adapter/internal/action/file.kt

@@ -62,6 +62,8 @@ internal suspend fun onUploadFile(stream: InputStream, path: String, fileName: S
         uploadFold.uploadNewFile(uploadFileName, it)
     }
 
+    contact.sendMessage(file.toMessage())
+
     return ElementResult(
         RemoteFileDTO(file, false).toJsonElement()
     )