compose typeahead: Refactor repeating code for all and everyone mentions.
compose typeahead: Refactor repeating code for all and everyone mentions.

This is minor refactor with which we can simply add other aliases for
"all" and "everyone" mentions.

punchagan/zulip,eeshangarg/zulip,hackerkid/zulip,andersk/zulip,dhcrzf/zulip,punchagan/zulip,jackrzhang/zulip,rht/zulip,zulip/zulip,hackerkid/zulip,rht/zulip,kou/zulip,shubhamdhama/zulip,shubhamdhama/zulip,synicalsyntax/zulip,synicalsyntax/zulip,tommyip/zulip,tommyip/zulip,shubhamdhama/zulip,rishig/zulip,timabbott/zulip,brainwane/zulip,rht/zulip,dhcrzf/zulip,jackrzhang/zulip,andersk/zulip,zulip/zulip,kou/zulip,eeshangarg/zulip,showell/zulip,synicalsyntax/zulip,dhcrzf/zulip,andersk/zulip,zulip/zulip,jackrzhang/zulip,tommyip/zulip,punchagan/zulip,brainwane/zulip,shubhamdhama/zulip,tommyip/zulip,timabbott/zulip,rishig/zulip,showell/zulip,showell/zulip,kou/zulip,kou/zulip,tommyip/zulip,punchagan/zulip,brainwane/zulip,eeshangarg/zulip,andersk/zulip,kou/zulip,showell/zulip,eeshangarg/zulip,tommyip/zulip,zulip/zulip,tommyip/zulip,timabbott/zulip,andersk/zulip,synicalsyntax/zulip,zulip/zulip,showell/zulip,kou/zulip,hackerkid/zulip,rht/zulip,rishig/zulip,synicalsyntax/zulip,timabbott/zulip,punchagan/zulip,zulip/zulip,punchagan/zulip,hackerkid/zulip,hackerkid/zulip,brainwane/zulip,timabbott/zulip,shubhamdhama/zulip,kou/zulip,shubhamdhama/zulip,hackerkid/zulip,eeshangarg/zulip,eeshangarg/zulip,jackrzhang/zulip,shubhamdhama/zulip,hackerkid/zulip,rishig/zulip,brainwane/zulip,andersk/zulip,rishig/zulip,dhcrzf/zulip,andersk/zulip,jackrzhang/zulip,timabbott/zulip,jackrzhang/zulip,brainwane/zulip,dhcrzf/zulip,rishig/zulip,synicalsyntax/zulip,dhcrzf/zulip,rht/zulip,dhcrzf/zulip,brainwane/zulip,punchagan/zulip,rishig/zulip,timabbott/zulip,zulip/zulip,showell/zulip,rht/zulip,rht/zulip,synicalsyntax/zulip,showell/zulip,eeshangarg/zulip,jackrzhang/zulip