emit unreadCountChanged when deleting new message.
emit unreadCountChanged when deleting new message.

f-w/MyGovBC-core-client,f-w/MyGovBC-core-client,f-w/MyGovBC-core-client,bcgov/MyGovBC-MSP,bcgov/MyGovBC-MSP,bcgov/MyGovBC-MSP,bcgov/MyGovBC-MSP,f-w/MyGovBC-core-client