package/freerdp: bump to version 2.8.0

Drop fourth patch (already in version)

https://github.com/FreeRDP/FreeRDP/releases/tag/2.8.0



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>