[Scenario Editor] Center the magic book 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

I suggest centering the magic book sprite horizontally in the square of the adventure map.

In fheroes2:

Describe the possible solution

Center the magic book sprite horizontally in the square of the adventure map.

Additional info

No response