reactions: Use parameter destructuring in view.remove_reaction.
reactions: Use parameter destructuring in view.remove_reaction.

This is a pure code refactor for readability.

rht/zulip,andersk/zulip,zulip/zulip,zulip/zulip,eeshangarg/zulip,rht/zulip,zulip/zulip,andersk/zulip,zulip/zulip,andersk/zulip,zulip/zulip,eeshangarg/zulip,kou/zulip,eeshangarg/zulip,eeshangarg/zulip,kou/zulip,eeshangarg/zulip,rht/zulip,rht/zulip,andersk/zulip,rht/zulip,kou/zulip,andersk/zulip,rht/zulip,zulip/zulip,eeshangarg/zulip,zulip/zulip,kou/zulip,kou/zulip,kou/zulip,andersk/zulip,rht/zulip,eeshangarg/zulip,kou/zulip,andersk/zulip