New copyright logo for nokia maps plugin

Since Nokia maps is now Here maps we need to update the copyrigt
logo in the maps view to the Here logo.

Change-Id: Ice6b08afbe7eedefd93a6fb1733df1aa07f30577
Reviewed-by: Aaron McCarthy <mccarthy.aaron@gmail.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>