fix bugs:add default User-Agent

java.ajax(url):it doesnot work if url has no urlOptions

app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeUrl.kt

@@ -189,9 +189,6 @@ class AnalyzeUrl(
                             ?.let { headerMap.putAll(it) }
                     }
                 }
-                headerMap[UA_NAME] ?: let {
-                    headerMap[UA_NAME] = userAgent
-                }
                 option.charset?.let { charset = it }
                 option.body?.let {
                     body = if (it is String) it else GSON.toJson(it)
@@ -206,6 +203,9 @@ class AnalyzeUrl(
                 }
             }
         }
+        headerMap[UA_NAME] ?: let {
+            headerMap[UA_NAME] = userAgent
+        }
         when (method) {
             RequestMethod.GET -> {
                 if (!useWebView) {