subscriptions: Fix alignment and size of stream icons.
subscriptions: Fix alignment and size of stream icons.

Reduced size of globe icon and fixed alignment of `#` icon.

andersk/zulip,andersk/zulip,zulip/zulip,andersk/zulip,rht/zulip,rht/zulip,zulip/zulip,rht/zulip,andersk/zulip,zulip/zulip,zulip/zulip,andersk/zulip,zulip/zulip,andersk/zulip,rht/zulip,rht/zulip,andersk/zulip,zulip/zulip,rht/zulip,rht/zulip,zulip/zulip