[1.1] Unable to shoot spells at units in corner of tactical maps when corner has slight raise
On a tactical map, when an ennemy unit goes in a corner that is not flat (that is rising up a bit), you cannot shoot it with a spell.
For example, if you shoot a fire ball at a group of 3x3 units, one of them being in the corner in question, when you aim, only the 8 others squares have their background color changed (it's not possible to have it too on the square in question), and when you shoot, only the 8 others are impacted.
