node tests: Clean up nyc arguments.
node tests: Clean up nyc arguments.

nyc was added in 29f04511c00faa97c919a9084707d539d5b11d41

All the stuff after "&&" was actually passed to
node, because we didn't use shell=True, so the
"nyc report" command didn't run, and the ugly
finder.js code just skipped over all the final tokens.

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