[PATCH] Some BoltShooter issues

[fatherbushido]

• bolt_accuracy tech seems to have a wrong affects
• sele doesn't have ballista, so we can remove this tech
• ptol boltshoter was missing in the production queue due to a special template name

[elexis]

In 18243:

Make ptolemian bolt shooter available. Patch by fatherbushido, fixes #4006.

Let ptolemians produce it in a captured siege workshop.
Remove bolt shooter technology from seleucids, as they don't have that weapon.

[elexis]

Thanks