Open compose box more aggressively for PM narrows.
Open compose box more aggressively for PM narrows.

We now auto-open the compose box whenever somebody narrows to
a "pure" PM narrow.  We already did this for buddy list clicks,
so this make it work the same for other ways of narrowing to
PM conversation.  Here, we optimize for composing, vs. reading,
since PM conversations tend to have lots of back and forth.

(Contrast this to stream conversations, where there's a higher
likelihood of lurking or doing a quick narrow to re-read some
message from the stream.)

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