js: Convert _.isObject to typeof.
js: Convert _.isObject to typeof.

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

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