Remove my testnet DNS seed as I currently don't have the capacity to keep it up to date.

Github-Pull: #11527
Rebased-From: 132d3225f3
Tree-SHA512: 3738afd8070fa601b5039e268088b7f3827613dbc37fae192b96b13c91f56d41fa3209533a3cad876c4e673b19015aabfce331b0b5f46a0ac518d00816e912a4

src/chainparams.cpp

@@ -228,7 +228,6 @@ public:
         vSeeds.emplace_back("testnet-seed.bitcoin.jonasschnelli.ch", true);
         vSeeds.emplace_back("seed.tbtc.petertodd.org", true);
         vSeeds.emplace_back("testnet-seed.bluematt.me", false);
-        vSeeds.emplace_back("testnet-seed.bitcoin.schildbach.de", false);
 
         base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,111);
         base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,196);