kodev: update activate command

There's no need for messing with the LUA environment using luarocks
anymore, since all testing requirements are already provided by the
build system, and luacheck can be run with a different LUA version
than the one being checked.

kodev

@@ -311,7 +311,6 @@ function kodev-activate() {
     parse_options '' '' '0' "$@"
     info "adding ${CURDIR} to \$PATH..."
     export PATH="${PATH}:${CURDIR}"
-    eval "$(luarocks --lua-version=5.1 path --bin)"
     exec "${SHELL}"
 }