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games/doom: fix ouchface not being shown when it should be (thanks qu7uux)

due to a typo in st_stuff.c:ST_updateFaceWidget(), doomguy mistakenly never
looks shocked when taking more than 20 damage, but rather when he gains more
than 20 health while being hit.
this is a cosmetic bug in all old versions of doom's executables, but it seems
appropriate to fix.
simple test: fire a rocket at a nearby wall, taking enough damage.

--- a/sys/src/games/doom/st_stuff.c

+++ b/sys/src/games/doom/st_stuff.c

@@ -801,7 +801,7 @@

 	    // being attacked

 	    priority = 7;

-	    if (plyr->health - st_oldhealth > ST_MUCHPAIN)

+	    if (st_oldhealth - plyr->health > ST_MUCHPAIN)

 	    {

 		st_facecount = ST_TURNCOUNT;

 		st_faceindex = ST_calcPainOffset() + ST_OUCHOFFSET;

@@ -854,7 +854,7 @@

 	// getting hurt because of your own damn stupidity

 	if (plyr->damagecount)

 	{

-	    if (plyr->health - st_oldhealth > ST_MUCHPAIN)

+	    if (st_oldhealth - plyr->health > ST_MUCHPAIN)

 	    {

 		priority = 7;

 		st_facecount = ST_TURNCOUNT;