fix #9332: remove any initial maximum zoom limit (set from 0 to 25)
fix #9332: remove any initial maximum zoom limit (set from 0 to 25)

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