dropbox: Fix incorrect placement of notify_bot_owner_on_invalid_json.
dropbox: Fix incorrect placement of notify_bot_owner_on_invalid_json.

This was an error I introduced in editing
b79213d2602291a4c7ccbafe0f775f77db60665b.

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