lightbox: Remove redundant conversion of `image` to jQuery object.
lightbox: Remove redundant conversion of `image` to jQuery object.

`image` passed to lightbox.open() is already a jQuery object,
so we don't need to convert it explicitly. Also, the parameter
is renamed from `image` to `$image`.

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