some lint optimization in AboutActivity
some lint optimization in AboutActivity

Rules:
- SameParameterValue
- UnusedAssignment

tobiasge/cgeo,matej116/cgeo,tobiasge/cgeo,matej116/cgeo,cgeo/cgeo,rsudev/c-geo-opensource,cgeo/cgeo,matej116/cgeo,rsudev/c-geo-opensource,rsudev/c-geo-opensource,cgeo/cgeo,cgeo/cgeo,tobiasge/cgeo