Use current block number in ChannelNewBalance event
Use current block number in ChannelNewBalance event

Previously the ChannelNewBalance event relied on the opened block being
set at `deposit` time, since this change we will report the current
`block.number` instead.

tomashaber/raiden,hackaugusto/raiden,charles-cooper/raiden,charles-cooper/raiden,hackaugusto/raiden,tomashaber/raiden,tomashaber/raiden,tomashaber/raiden,tomashaber/raiden