minor: Fix return value and redundant variables in pill_typeahead.
minor: Fix return value and redundant variables in pill_typeahead.

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