diablo: add BUGFIX for PressChar; out-of-bounds access to dungeon (#2266)

* diablo: add BUGFIX for PressChar; out-of-bounds access to dungeon

* diablo: update BUGFIX comment of PressChar, should be dPiece not dungeon

Pointed out by @galaxyhaxz in https://github.com/diasurgical/devilution/pull/2266#discussion_r786302976

Source/diablo.cpp

@@ -1520,6 +1520,7 @@ static void PressChar(WPARAM vkey)
 		if (debug_mode_key_inverted_v) {
 			sprintf(tempstr, "PX = %i  PY = %i", plr[myplr]._px, plr[myplr]._py);
 			NetSendCmdString(1 << myplr, tempstr);
+			// BUGFIX: out-of-bounds access to dungeon; should be `dPiece[cursmx][cursmy]`, was `dungeon[cursmx][cursmy]`.
 			sprintf(tempstr, "CX = %i  CY = %i  DP = %i", cursmx, cursmy, dungeon[cursmx][cursmy]);
 			NetSendCmdString(1 << myplr, tempstr);
 		}