tools: Fix running test-js-with-node from arbitrary paths.
tools: Fix running test-js-with-node from arbitrary paths.

zulip/zulip,hackerkid/zulip,hackerkid/zulip,eeshangarg/zulip,andersk/zulip,andersk/zulip,punchagan/zulip,hackerkid/zulip,rht/zulip,kou/zulip,kou/zulip,hackerkid/zulip,rht/zulip,hackerkid/zulip,punchagan/zulip,hackerkid/zulip,eeshangarg/zulip,rht/zulip,andersk/zulip,kou/zulip,rht/zulip,kou/zulip,rht/zulip,zulip/zulip,andersk/zulip,hackerkid/zulip,rht/zulip,punchagan/zulip,eeshangarg/zulip,rht/zulip,punchagan/zulip,zulip/zulip,punchagan/zulip,zulip/zulip,kou/zulip,andersk/zulip,zulip/zulip,eeshangarg/zulip,zulip/zulip,punchagan/zulip,eeshangarg/zulip,punchagan/zulip,kou/zulip,kou/zulip,andersk/zulip,eeshangarg/zulip,zulip/zulip,eeshangarg/zulip,andersk/zulip