fix db upgrade if coming from versions < 81 (fix #9307)
fix db upgrade if coming from versions < 81 (fix #9307)

tobiasge/cgeo,S-Bartfast/cgeo,rsudev/c-geo-opensource,cgeo/cgeo,S-Bartfast/cgeo,auricgoldfinger/cgeo,auricgoldfinger/cgeo,rsudev/c-geo-opensource,cgeo/cgeo,cgeo/cgeo,matej116/cgeo,matej116/cgeo,tobiasge/cgeo,cgeo/cgeo,tobiasge/cgeo,rsudev/c-geo-opensource,S-Bartfast/cgeo,auricgoldfinger/cgeo,matej116/cgeo