testdata: simplify goversion test (#232)

As per the TODO, just set up the files in the right places.

testdata/scripts/goversion.txt

@@ -1,9 +1,5 @@
-# TODO: Place file direct to .bin directory
-mkdir .bin
-cp go.sh .bin/go
-cp go.bat .bin/go.bat
 chmod 777 .bin/go
-env PATH=.bin${:}${PATH}
+env PATH=${WORK}/.bin${:}${PATH}
 
 # Check incorrect go install
 env GO_VERSION=''
@@ -45,11 +41,11 @@ env GO_VERSION='go version go1.15.2 windows/amd64'
 -- main.go --
 package main
 
--- go.sh --
+-- .bin/go --
 #!/bin/sh
 
 [ -z "$GO_VERSION" ] && exit 1 || echo "$GO_VERSION"
 
--- go.bat --
+-- .bin/go.bat --
 @echo off
 IF DEFINED GO_VERSION (echo %GO_VERSION%) ELSE (exit 1)