GoBackend: Ensure we're unmetered on API 29 as well

VPN apps targetting Android 10 are treated as metered by default.

Source: https://developer.android.com/reference/android/net/VpnService.Builder.html#setMetered(boolean)

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

app/src/main/java/com/wireguard/android/backend/GoBackend.java

@@ -8,6 +8,7 @@ package com.wireguard.android.backend;
 import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
+import android.os.Build;
 import android.os.ParcelFileDescriptor;
 import androidx.annotation.Nullable;
 import androidx.collection.ArraySet;
@@ -212,6 +213,10 @@ public final class GoBackend implements Backend {
 
             builder.setMtu(config.getInterface().getMtu().orElse(1280));
 
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                builder.setMetered(false);
+            }
+
             builder.setBlocking(true);
             try (final ParcelFileDescriptor tun = builder.establish()) {
                 if (tun == null)