Change default connection url to v2fly

app/src/main/java/io/nekohasekai/sagernet/Constants.kt

@@ -21,7 +21,7 @@
 
 package io.nekohasekai.sagernet
 
-const val CONNECTION_TEST_URL = "https://cp.cloudflare.com"
+const val CONNECTION_TEST_URL = "https://api.v2fly.org/checkConnection.svgz"
 
 object Key {
 

app/src/main/res/xml/global_preferences.xml

@@ -193,7 +193,7 @@
 
     <PreferenceCategory app:title="@string/cag_misc">
         <io.nekohasekai.sagernet.widget.LinkPreference
-            app:defaultValue="https://cp.cloudflare.com"
+            app:defaultValue="https://api.v2fly.org/checkConnection.svgz"
             app:icon="@drawable/ic_baseline_cast_connected_24"
             app:key="connectionTestURL"
             app:title="@string/connection_test_url"