Do not skip fields from Client.defaults that are explicitly defined but appear to be matching the default

[jingyuanliang]

For example, at least as tested with the Microsoft's official Android client, I have to set redirectclipboard:i:1 to make it redirect clipboard by default, even if it's declared as rdp:"redirectclipboard" default:"true" in https://github.com/bolkedebruin/rdpgw/blob/372dc43ef215fb98bb48ff46c584366f248047ef/cmd/rdpgw/rdp/rdp.go#L66C47-L66C87