comms/wsjtx: Update to 2.5.4

	        Release: WSJT-X 2.5.4
	             Dec 28, 2021
	        ----------------------

This is mostly a bug fix release. It has the following changes since
release 2.5.3:

WSJTX:

• Repair a defect that caused occasional crashes when in QSO with stations using nonstandard callsigns.

Reported by: @portscout