fix pull request #367 - mind flayer psychic blast

hitting a hidden monster didn't reveal that monster.  It stayed
hidden despite the feedback describing it as if it could be seen.

The pull request's two line fix handled a monster's blast hitting
another monster but left two related issues as-is:  monster's blast
hitting hidden poly'd hero left hero unrevealed and poly'd hero's
blast left hidden monster unrevealed.  Same code, different bug:
poly'd hero's blast affected mindless monsters.

This unhides an affected target before the message about it being
hit rather than after.  That would look better if preceded by a
message describing the object (mimic or hides-under) or furniture
(mimic) or empty spot (ceiling hider) as being or concealing a
monster but I didn't put in sufficient effort to accomplish that.

Fixes #367
Fixes #362

doc/fixes37.0

@@ -1,4 +1,4 @@
-$NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.246 $ $NHDT-Date: 1594630713 2020/07/13 08:58:33 $
+$NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.247 $ $NHDT-Date: 1594727746 2020/07/14 11:55:46 $
 
 General Fixes and Modified Features
 -----------------------------------
@@ -221,6 +221,10 @@ if the Wizard of Yendor fled up the stairs on level 1, the game would behave
 	as if he was still in play, but he wouldn't be on migrating monsters
 	list so couldn't be brought back and wouldn't appear on Plane of Earth
 	(stale non-zero value for context.no_of_wizards)
+if a mind flayer's psychic blast targetted a hidden monster, feedback named
+	the monster but it wasn't brought out of hiding
+hero poly'd into a mind flayer who used #monster to emit a psychic blast was
+	able to harm mindless monsters with it
 
 
 Fixes to 3.7.0-x Problems that Were Exposed Via git Repository