modules/rtv: gc module contexts on channel switch

This probably needs more work, but this at a minimum should
prevent us from leaking contexts in the stream at the myriad
paths we construct them at.

Context registration replaces what's at the existing path, but
rtv produces all sorts of setup paths, and I haven't added any
explicit unregistration of contexts at this time.  That might
change, but for now let's just use this gc mechanism even if it's
a temporary hack.

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