Remove swagger default

specification/signalr/resource-manager/Microsoft.SignalRService/preview/2024-10-01-preview/signalr.json

@@ -3042,7 +3042,6 @@
         "keepAliveIntervalInSeconds": {
           "format": "int32",
           "description": "Gets or sets the Keep-Alive Interval. Optional to set.\r\nValue is in seconds.\r\nThe default value is 15 seconds.\r\nCustomers should set this value to a shorter period if they want the service to send keep-alive messages more frequently, \r\nensuring timely checks of the connection status.\r\nConversely, customers can set this value to a longer period if they want the service to send keep-alive messages less frequently, \r\nreducing network traffic, but note that it may take longer to detect a disconnection.\r\nThis interval ensures that the connection is maintained by sending periodic keep-alive messages to the client.",
-          "default": 15,
           "maximum": 120,
           "minimum": 1,
           "type": "integer"