Add deep argument to the type of cloneNode()

[tai2]

Node's cloneNode() should take the deep argument in type definition. Otherwise, other derived classes like Element also cannot take that parameter in TS.

[WebReflection]

to be honest, I am not sure this is a TS shenanigan but cloneNode already takes an optional argument ... I'll merge it, let's hope it will stay around ... if it doesn't, I am afraid I need to change the signature in the code, not in its .d.ts definition.