Updated check-stylish-ignore file

Author: coot

scripts/ci/check-stylish-ignore

@@ -2,6 +2,7 @@
 ouroboros-network-api/src/Ouroboros/Network/Protocol/Type.hs
 ouroboros-network/src/Ouroboros/Network/Diffusion/P2P.hs
 ouroboros-network/src/Ouroboros/Network/PeerSelection/Governor/Types.hs
+ouroboros-network/sim-tests-lib/Test/Ouroboros/Network/Testnet.hs
 network-mux/src/Network/Mux/TCPInfo.hs
 network-mux/src/Network/Mux/Bearer.hs
 network-mux/src/Network/Mux/Bearer/Pipe.hs