remove tint from copyright sign (fix #10855)
remove tint from copyright sign (fix #10855)

rsudev/c-geo-opensource,cgeo/cgeo,tobiasge/cgeo,rsudev/c-geo-opensource,cgeo/cgeo,cgeo/cgeo,cgeo/cgeo,tobiasge/cgeo,rsudev/c-geo-opensource,tobiasge/cgeo