Explicitely set user resolution to a multiple of 4
Because of RDP and codecs speicifications, in most cases the window resolution must be set as a multiple of 4, more over because of a not yet well identified isse, width values of less then 642 causes issues, so we force the minimum resolution to 644 when AVC:444 is in use.
Should fix #2507 (closed)
Signed-off-by: Antenore Gatta antenore@simbiosi.org