Fixed crash on Deton explosion.

(Detons need deathstates, otherwise they are removed partway through exploding. Not fun.)

src/info.c

@@ -3426,7 +3426,7 @@ mobjinfo_t mobjinfo[NUMMOBJTYPES] =
 		sfx_None,       // painsound
 		S_NULL,         // meleestate
 		S_NULL,         // missilestate
-		S_NULL,         // deathstate
+		S_XPLD1,        // deathstate
 		S_DETON16,      // xdeathstate
 		sfx_pop,        // deathsound
 		1*FRACUNIT,     // speed