Report proper media-source-supported IPP field on numeric InputSlots. #859

Report proper media-source-supported IPP field on numeric InputSlots. #859

Windows 11 version 22H2 build 22621.2861 silently fails to add Mopria
auto-discovered printer if it reports a number (a digit as a string)
in media-source-supported field.
If you try to add such a printer using modern control panel, it will
show endless "connecting…" message, and if you add it using old
control panel, it would be added "successfully", but under
"unrecognized" device type, and you won't be able to print on it.

Fix the issue by
    * By comparing also by human-readable InputSlot name
    * By mapping number to "tray-N" string