streams-settings: Fix toggle icon not updating.
streams-settings: Fix toggle icon not updating.

This commit fixes a regression which was introduced while
we were removing icon-vector and replacing the same with
font-awesome. We forgot to update the toggle icons from the
JS file.

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