change/revert special rod of ignition targeting

[HardboiledGargoyle]

The targeter automatically highlights all squares that would blow up due to the fireball effect, if the beam managed to hit every single target. This can be helpful the first time you try the rod out, because you figure out how it works about 10 seconds faster, assuming you did not read the description for some reason. Afterwards, it is not helpful, because you could easily look at the 1-tile wide beam targeter and mentally fill in where expanding fireballs would hit. The way it is now, aiming is harder, because can't easily see how the beam will travel and which monsters it could hit. You actually have to deduce, from the tiles that the targeter does not highlight, the monsters that cannot directly get hit by the beam, and even this might not be foolproof for all I can tell. So please, simplify the targeter to be 1 tile wide, or draw the "overhang" targeting in another color.