Fix Quad9 DoH setting

app/src/main/java/eu/kanade/tachiyomi/network/DohProviders.kt

@@ -26,7 +26,7 @@ fun OkHttpClient.Builder.dohCloudflare() = dns(
             InetAddress.getByName("2606:4700:4700::1111"),
             InetAddress.getByName("2606:4700:4700::1001"),
             InetAddress.getByName("2606:4700:4700::0064"),
-            InetAddress.getByName("2606:4700:4700::6400")
+            InetAddress.getByName("2606:4700:4700::6400"),
         )
         .build()
 )
@@ -43,7 +43,8 @@ fun OkHttpClient.Builder.dohGoogle() = dns(
         .build()
 )
 
-// AdGuard "Default" DNS works too but for the sake of making sure no site is blacklisted, i picked "Unfiltered"
+// AdGuard "Default" DNS works too but for the sake of making sure no site is blacklisted,
+// we use "Unfiltered"
 fun OkHttpClient.Builder.dohAdGuard() = dns(
     DnsOverHttps.Builder().client(build())
         .url("https://dns-unfiltered.adguard.com/dns-query".toHttpUrl())

app/src/main/java/eu/kanade/tachiyomi/network/NetworkHelper.kt

@@ -41,7 +41,7 @@ class NetworkHelper(context: Context) {
                 PREF_DOH_CLOUDFLARE -> builder.dohCloudflare()
                 PREF_DOH_GOOGLE -> builder.dohGoogle()
                 PREF_DOH_ADGUARD -> builder.dohAdGuard()
-                PREF_DOH_QUAD9 -> builder.dohAdGuard()
+                PREF_DOH_QUAD9 -> builder.dohQuad9()
             }
 
             return builder