Revert "I messed up the filtering the first time around."

This reverts commit 7d264ea82b652336e71d1722176783c13646dce2.
Revert "make list_ftdi_ports_by_vid_pid actually filter on vid/pid (not sure if this is necessary)"

This reverts commit f78bcc6b0d6ed04253776b9d882fa6b0b96f5d58.