Merge pull request #14112 from silicons/ex_act_3

~~hugboxes~~ fixes the bug (that was probably my fault) that makes 1 dev explosions ALWAYS delete brain

code/game/atoms.dm

@@ -548,7 +548,7 @@
 /atom/proc/contents_explosion(severity, target)
 	return //For handling the effects of explosions on contents that would not normally be effected
 
-/atom/proc/ex_act(severity, target)
+/atom/proc/ex_act(severity, target, datum/explosion/E)
 	set waitfor = FALSE
 	contents_explosion(severity, target)
 	SEND_SIGNAL(src, COMSIG_ATOM_EX_ACT, severity, target)