node tests: Remove stub_selected_message.
node tests: Remove stub_selected_message.

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