left-sidebar: Combine two selections for `#stream-filters-container` to one.
left-sidebar: Combine two selections for `#stream-filters-container` to one.

This combines two different selections of the
`#stream-filters-container` into one chained selection and writes a
comment on how it is possible due to the return value of `.css`.

brockwhittaker/zulip,rht/zulip,punchagan/zulip,dhcrzf/zulip,hackerkid/zulip,rishig/zulip,tommyip/zulip,mahim97/zulip,hackerkid/zulip,jackrzhang/zulip,rht/zulip,hackerkid/zulip,brockwhittaker/zulip,shubhamdhama/zulip,brainwane/zulip,andersk/zulip,kou/zulip,jackrzhang/zulip,synicalsyntax/zulip,shubhamdhama/zulip,amanharitsh123/zulip,amanharitsh123/zulip,eeshangarg/zulip,showell/zulip,showell/zulip,jackrzhang/zulip,eeshangarg/zulip,jackrzhang/zulip,zulip/zulip,rht/zulip,eeshangarg/zulip,rishig/zulip,shubhamdhama/zulip,zulip/zulip,mahim97/zulip,kou/zulip,brainwane/zulip,jackrzhang/zulip,Galexrt/zulip,rht/zulip,eeshangarg/zulip,kou/zulip,showell/zulip,zulip/zulip,synicalsyntax/zulip,timabbott/zulip,timabbott/zulip,dhcrzf/zulip,amanharitsh123/zulip,dhcrzf/zulip,amanharitsh123/zulip,dhcrzf/zulip,timabbott/zulip,rht/zulip,mahim97/zulip,tommyip/zulip,timabbott/zulip,punchagan/zulip,showell/zulip,Galexrt/zulip,tommyip/zulip,shubhamdhama/zulip,brockwhittaker/zulip,dhcrzf/zulip,eeshangarg/zulip,punchagan/zulip,mahim97/zulip,mahim97/zulip,zulip/zulip,showell/zulip,rht/zulip,shubhamdhama/zulip,brainwane/zulip,hackerkid/zulip,rishig/zulip,showell/zulip,rishig/zulip,jackrzhang/zulip,shubhamdhama/zulip,brainwane/zulip,zulip/zulip,tommyip/zulip,andersk/zulip,rishig/zulip,zulip/zulip,Galexrt/zulip,tommyip/zulip,synicalsyntax/zulip,showell/zulip,synicalsyntax/zulip,synicalsyntax/zulip,synicalsyntax/zulip,andersk/zulip,dhcrzf/zulip,brockwhittaker/zulip,rishig/zulip,andersk/zulip,kou/zulip,andersk/zulip,andersk/zulip,Galexrt/zulip,rishig/zulip,punchagan/zulip,eeshangarg/zulip,zulip/zulip,brockwhittaker/zulip,punchagan/zulip,tommyip/zulip,punchagan/zulip,timabbott/zulip,brainwane/zulip,jackrzhang/zulip,Galexrt/zulip,brockwhittaker/zulip,punchagan/zulip,Galexrt/zulip,hackerkid/zulip,kou/zulip,eeshangarg/zulip,kou/zulip,hackerkid/zulip,kou/zulip,amanharitsh123/zulip,tommyip/zulip,andersk/zulip,hackerkid/zulip,Galexrt/zulip,amanharitsh123/zulip,dhcrzf/zulip,rht/zulip,shubhamdhama/zulip,timabbott/zulip,synicalsyntax/zulip,brainwane/zulip,timabbott/zulip,mahim97/zulip,brainwane/zulip