Added the function of deleting duplicate configurations

V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/MainActivity.kt

@@ -297,7 +297,14 @@ class MainActivity : BaseActivity(), NavigationView.OnNavigationItemSelectedList
                     .show()
             true
         }
-
+        R.id.del_duplicate_config-> {
+            AlertDialog.Builder(this).setMessage(R.string.del_config_comfirm)
+                .setPositiveButton(android.R.string.ok) { _, _ ->
+                    mainViewModel.removeDuplicateServer()
+                }
+                .show()
+            true
+        }
         R.id.del_invalid_config -> {
             AlertDialog.Builder(this).setMessage(R.string.del_config_comfirm)
                 .setPositiveButton(android.R.string.ok) { _, _ ->