Use consistent json field name for room configuration grant (#762)

Author: biglittlebigben

.changeset/thick-lamps-tease.md

@@ -0,0 +1,5 @@
+---
+"github.com/livekit/protocol": patch
+---
+
+Use consistent json field name for room configuration grant

auth/grants.go

@@ -34,7 +34,7 @@ type VideoGrant struct {
 	RoomJoin  bool   `json:"roomJoin,omitempty"`
 	Room      string `json:"room,omitempty"`
 	// Name of the room configuration to apply to the room if created
-	RoomConfiguration string `json:"room_configuration,omitempty"`
+	RoomConfiguration string `json:"roomConfiguration,omitempty"`
 
 	// permissions within a room, if none of the permissions are set explicitly
 	// it will be granted with all publish and subscribe permissions