dev_settings: Fix run-dev SyntaxError.
dev_settings: Fix run-dev SyntaxError.

zthumbor loads dev_settings from Python 2.

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

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