Fix "IDHandler.get_prop is not a function" error when calling some methods on WebRTCDataChannel
Fix "IDHandler.get_prop is not a function" error when calling some methods on WebRTCDataChannel

(cherry picked from commit 756ed308ee0bf1a73539fe8074770adb1b832c40)

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot