webpack: Use more consistent bundle naming scheme.
webpack: Use more consistent bundle naming scheme.

This way, both our JS and CSS files using .chunkhash.ext as their
naming scheme.

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