Properly handle mounting while stealthed

[NoReturn]

Atm if you try to mount while stealthed you get an error stating you can't mount while in shapeshift form. You need first to right-click/cancel the stealth buff then mount.

Suggested fix: https://github.com/NoReturn/one.server/commit/fdc5be9

[DomGries]

Pretty sure this should be done with aura remove flags

[Nighoo]

yes, we had this discussion some time ago :|

[NoReturn]

I know, bumped the issue since no other feedback was given and would've been lost.