[zplayer] Some hearts become white from left to right

[Asuna Yuuki Nagato]

Steps to recreate:

1. In the editor, File->New
2. Place a 'Fire' enemy on the screen
3. Test the quest
4. Walk into the fire repeatedly
5. Observe the fullmost heart correctly becomes white from right to left, but the other two become white from left to right.

[Asuna Yuuki Nagato]

The hurting happens in gamedata::set_life

[Asuna Yuuki Nagato]

Commenting out the body of lifemeter in subscr.cpp doesn't have any affect on this bug.

[Asuna Yuuki Nagato]

The hearts are drawn by SW_GaugePiece::draw

[Asuna Yuuki Nagato]

Here is what overtile8 draws when called with various values of the tile parameter:

80181	upper right corner of widget box
103036	blackness
103376	full heart
103368	half-heart (empty on left side)
103380	empty heart
103388	half-heart (empty on right side)

[Asuna Yuuki Nagato]

A bit ugly, but making the if(fulltile) at the bottom of SW_GaugePiece::draw_piece look like this fixes it:

	if(fulltile)
		overtile16(dest,tile+offs,dx,dy,cset,0);
	else 
	{
		if( mtile + offs == 103368 ) // draw half-hearts that are empty on their right side, not left
			overtile8(dest, 103388, dx, dy, cset, 0);
		else
			overtile8(dest, mtile + offs, dx, dy, cset, 0);
	}