revert: 撤回 WebView UA 覆盖（与验证码失败无关）

Author: safe1ine

mobile/android/app/src/main/java/com/monkeycode/mobile/MainActivity.java

@@ -1,16 +1,5 @@
 package com.monkeycode.mobile;
 
-import android.os.Bundle;
 import com.getcapacitor.BridgeActivity;
 
-public class MainActivity extends BridgeActivity {
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        // 移除 WebView UA 中的 "wv" 标识，避免被验证码检测为机器人
-        getBridge().getWebView().getSettings().setUserAgentString(
-            "Mozilla/5.0 (Linux; Android 14) AppleWebKit/537.36 " +
-            "(KHTML, like Gecko) Chrome/124.0.0.0 Mobile Safari/537.36"
-        );
-    }
-}
+public class MainActivity extends BridgeActivity {}