LSIF: fix dev/launch.sh and address follow-up feedback
Created by: chrismwendt
Small PR to fix dev/launch.sh
and address follow-up feedback from https://github.com/sourcegraph/sourcegraph/pull/4799
Created by: chrismwendt
Small PR to fix dev/launch.sh
and address follow-up feedback from https://github.com/sourcegraph/sourcegraph/pull/4799