test_fixtures: Use cursor.execute correctly.
test_fixtures: Use cursor.execute correctly.

Signed-off-by: Anders Kaseorg <dfdb7392591db597bc41cf266a9c3bc12a2706e5@zulip.com>

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