test_slack_importer: Remove backslashes wrongly copied from JSON data
test_slack_importer: Remove backslashes wrongly copied from JSON data

https://github.com/houstondatavis/slack-export/blob/master/users.json

JSON or JavaScript decodes "\/" to / (and some encoders always write
"\/" to avoid accidentally creating a </script> tag), while Python
assumes "\/" is a typo for "\\/" and decodes it to \/.

Signed-off-by: Anders Kaseorg <087231934ba8fcf78bc142ce37d193b895ac03c4@mit.edu>

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