Fix camera stuck on after call transfer (#2188)
Fix camera stuck on after call transfer (#2188)

The 'Replaced' error code is handled specially (for better or worse)
so was leaving the capture feeds open. Use the 'transfer' hangup
reason which is what we should be using anyway (and were, on the line
below for the other call...)
matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk