Revert "Add GOROOT to .envrc"

This reverts commit 21548ef9ea34d7336be1c75becd83ee2f94491d1.
automatic promotion by GoCD workflow LoggregatorIntegrationTest/65 > IntegrationTests/1 > IntegrationTests

tests passed against https://github.com/cloudfoundry/cf-release/commit/5dd22b0291cd23d36125d60e4223d7a938f48f5a