attrcurse() on 'see invisible'

If hero has intrinsic see-invisible and a gremlin steals that, the
map wasn't being updated to hide invisible monsters (until the next
iteration of moveloop() after other monsters finished current turn).

doc/fixes37.0

@@ -711,6 +711,7 @@ fix some inconsistencies with applied bullwhip vs monster
 polymorphing while wearing an amulet of strangulation from a form that wasn't
 	vulnerable to one that was gave wrong message ("still constricts")
 for accessibility reasons, give a message when monster teleports
+if a gremlin stole intrinsic 'see invisible' the map wasn't updated properly
 
 
 Fixes to 3.7.0-x Problems that Were Exposed Via git Repository

src/display.c

@@ -1265,6 +1265,7 @@ under_ground(int mode)
  *      + hallucinating
  *      + doing a full screen redraw
  *      + see invisible times out or a ring of see invisible is taken off
+ *        or intrinsic see invisible is stolen by a gremlin
  *      + when a potion of see invisible is quaffed or a ring of see
  *        invisible is put on
  *      + gaining telepathy when blind [givit() in eat.c, pleased() in pray.c]

src/sit.c

@@ -479,6 +479,12 @@ attrcurse(void)
     case 7:
         if (HSee_invisible & INTRINSIC) {
             HSee_invisible &= ~INTRINSIC;
+            if (!See_invisible) {
+                set_mimic_blocking();
+                see_monsters();
+                /* might not be able to see self anymore */
+                newsym(u.ux, u.uy);
+            }
             You("%s!", Hallucination ? "tawt you taw a puttie tat"
                                      : "thought you saw something");
             break;