feat(call-flows): Removing cancel hook for ringing status.

resources/prosody-plugins/mod_muc_call.lua

 
 -- Status strings that trigger call events.
 local calling_status   = "calling"
-local ringing_status   = "ringing"
 local busy_status      = "busy"
 local rejected_status  = "rejected"
 local connected_status = "connected"
 --    Status      | Event Type
 --    _________________________
 --    "calling"   | INVITE
 --    "busy"      | CANCEL
 --    "rejected"  | CANCEL
 --    "connected" | CANCEL
 	local switch = function(status)
 	   case = {
 		  [calling_status]   = function() invite() end,
-		  [ringing_status]   = function() cancel() end,
 		  [busy_status]      = function() cancel() end,
 		  [rejected_status]  = function() cancel() end,
 		  [connected_status] = function() cancel() end