provision: Run inline-email-css only if required.
provision: Run inline-email-css only if required.

This saves a few hundred milliseconds on provision time.

Edited by tabbott to include email.css in the dependencies.

Fixes #9468.

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