sanity_check: current hero health better than max

Changes to setuhpmax() a couple of days ago to deal with sanity_check
for "current hero health as monster better than maximum" ended up
triggering sanity_check about "current hero health better than maximum"
when gaining experience level(s) while polymorphed.

src/end.c

@@ -702,7 +702,7 @@ savelife(int how)
         u.ulevel = 1;
     uhpmin = minuhpmax(10);
     if (u.uhpmax < uhpmin)
-        setuhpmax(uhpmin);
+        setuhpmax(uhpmin, TRUE);
     u.uhp = min(u.uhpmax, givehp);
     if (Upolyd) /* Unchanging, or death which bypasses losing hit points */
         u.mh = min(u.mhmax, givehp);