Avoid losing the proxy config during rotation changes

This isn't a true fix to the problem in general (there's other cases
where the activity could be disposed while the VPN is connected,
I think), but it solves the immediate problem neatly.

Author: pimterry

app/src/main/AndroidManifest.xml

@@ -38,6 +38,7 @@
         <activity
                 android:name=".MainActivity"
                 android:label="@string/app_name"
+                android:configChanges="orientation|screenSize|screenLayout|keyboardHidden"
                 android:launchMode="singleTask">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

app/src/main/java/tech/httptoolkit/android/MainActivity.kt

@@ -5,6 +5,7 @@ import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
 import android.content.pm.PackageManager
+import android.content.res.Configuration
 import android.net.Uri
 import android.net.VpnService
 import android.os.Bundle
@@ -105,6 +106,12 @@ class MainActivity : AppCompatActivity(), CoroutineScope by MainScope() {
         }
     }
 
+    override fun onConfigurationChanged(newConfig: Configuration) {
+        super.onConfigurationChanged(newConfig)
+        setContentView(R.layout.main_layout)
+        updateUi()
+    }
+
     override fun onResume() {
         super.onResume()
         Log.d(TAG, "onResume")