Set std_in to NoStream on the Anoma client process

We do not read from the Anoma client process so we do not need to open a
handle to stdin.

This fixes an issue where the Anoma client stdin does not get cleaned up
correctly on exit which causes subsequent input to the terminal to be corrupted.

src/Anoma/Effect/Base.hs

@@ -56,6 +56,7 @@ anomaCreateProcess = do
   return
     (proc "mix" ["run", "--no-halt", "-e", unpack (T.strip (decodeUtf8 anomaStartExs))])
       { std_out = CreatePipe,
+        std_in = NoStream,
         cwd = Just (toFilePath anomapath)
       }