lib.igc: filter model guess by pilot for non-igc loggers
lib.igc: filter model guess by pilot for non-igc loggers

Needed because some non-igc loggers don't use unique ids (like XCSoar).

skylines-project/skylines,kerel-fs/skylines,snip/skylines,RBE-Avionik/skylines,shadowoneau/skylines,dkm/skylines,TobiasLohner/SkyLines,Harry-R/skylines,shadowoneau/skylines,snip/skylines,RBE-Avionik/skylines,Turbo87/skylines,dkm/skylines,Turbo87/skylines,Harry-R/skylines,skylines-project/skylines,TobiasLohner/SkyLines,Harry-R/skylines,dkm/skylines,skylines-project/skylines,snip/skylines,RBE-Avionik/skylines,skylines-project/skylines,shadowoneau/skylines,kerel-fs/skylines,shadowoneau/skylines,Turbo87/skylines,RBE-Avionik/skylines,Turbo87/skylines,kerel-fs/skylines,TobiasLohner/SkyLines,Harry-R/skylines,dkm/skylines