net/xrdp{,-devel}: Update to 0.9.6

• mark -devel port as IGNORE since net/xrdp has been updated
• s/XRDP/xrdp/ in pkg-message, upstream usually spell it lowercase

x11-servers/x11rdp: remove port

This port is only required by net/xrdp 0.6.2. Since net/xrdp has been
updated to 0.9.6, it is no longer required any other port and not useful
with standalone at all. 0.9.1 or later uses x11-drivers/xorgxrdp instead.

Approved by: hrs (mentor, via email)
Relnotes: https://github.com/neutrinolabs/xrdp/releases/tag/v0.9.1

		https://github.com/neutrinolabs/xrdp/releases/tag/v0.9.2
		https://github.com/neutrinolabs/xrdp/releases/tag/v0.9.3
		https://github.com/neutrinolabs/xrdp/releases/tag/v0.9.4
		https://github.com/neutrinolabs/xrdp/releases/tag/v0.9.5
		https://github.com/neutrinolabs/xrdp/releases/tag/v0.9.6

Differential Revision: https://reviews.freebsd.org/D15375