settings: Fix default streams scrolling issue.
settings: Fix default streams scrolling issue.

The progressively rendered table extends too far down, causing the page
to scroll needlessly, which then causes there to be two scrollbars — a
scrollbar for the table and a view scrollbar outside that.

Fixes: #6391.

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