[git-packetline] remove now unnecessary duplicate tests

Author: Byron

git-packetline/tests/async_io/mod.rs

@@ -1,2 +1 @@
 mod encode;
-mod write;

git-packetline/tests/async_io/write.rs

@@ -1,4 +1,3 @@
 mod decode;
 mod encode;
 mod read;
-mod write;