settings: Use container variable for accessing top-level element.
settings: Use container variable for accessing top-level element.

This change was missed in 032d347b4f.

zulip/zulip,kou/zulip,zulip/zulip,kou/zulip,andersk/zulip,andersk/zulip,eeshangarg/zulip,rht/zulip,zulip/zulip,rht/zulip,zulip/zulip,rht/zulip,eeshangarg/zulip,andersk/zulip,kou/zulip,eeshangarg/zulip,andersk/zulip,zulip/zulip,eeshangarg/zulip,rht/zulip,andersk/zulip,kou/zulip,rht/zulip,kou/zulip,kou/zulip,zulip/zulip,andersk/zulip,zulip/zulip,andersk/zulip,eeshangarg/zulip,kou/zulip,rht/zulip,eeshangarg/zulip,rht/zulip,eeshangarg/zulip