compose menu: Rename `narrow` to `destinationNarrow`
compose menu: Rename `narrow` to `destinationNarrow`

`narrow` is too generic and does not reveal the purpose. This
corresponds to the `destinationNarrow` in the `ComposeBox` component
so rename it to this better name.

vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile