Adventure map, center the spell scroll sprite horizontally in the square of the adventure map

[LeHerosInconnu]

Preliminary checks

• [X] I've checked that there aren't other open issues on the same topic.

Describe the problem requiring a solution

It has been bugging me for a long time, even in the original game, that the spell scroll sprite isn't centered horizontally in the square of the adventure map. I corrected this in the original game by modifying the original sprite. It would be nice to do this as standard in fheroes2. :)

In original game:

In original game with the corrected graphic:

In fheroes2:

Describe the possible solution

Center the spell scroll sprite horizontally in the square of the adventure map.

Additional info

Related issue: https://github.com/ihhub/fheroes2/issues/8756.