[ADD] Fill withdraw event fields on pool suspension

Fill "from" field of the withdraw events when pools get's suspended. If possible also fill "emit_asset" and "emit_rune" to update pool depths but this is not crucial. "liquidity_provider_units" is already filled properly.

Background: It happens that pools get suspended then re-staged later. For this reason Midgard state should be kept sane for suspended pools.

Currently Midgard pool units per members are off because of this.