Fix password changing getting stuck if wrong password is entered once

src/network/serverpackethandler.cpp

@@ -1640,6 +1640,7 @@ void Server::handleCommand_SrpBytesA(NetworkPacket* pkt)
 			<< std::endl;
 		if (wantSudo) {
 			DenySudoAccess(peer_id);
+			client->resetChosenMech();
 			return;
 		}
 
@@ -1706,6 +1707,7 @@ void Server::handleCommand_SrpBytesM(NetworkPacket* pkt)
 				<< " tried to change their password, but supplied wrong"
 				<< " (SRP) password for authentication." << std::endl;
 			DenySudoAccess(peer_id);
+			client->resetChosenMech();
 			return;
 		}