hipchat import: Always include deleted users in import.
hipchat import: Always include deleted users in import.

The slim_mode setting had been incorrectly configured to skip
"deleted" users, resulting in bugs where private messages with deleted
users would not be imported.

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