[array] Simplify bfind() positioning

I had copied the old scheme from fontconfig's fccharset.c.  I just
convinced myself that this change is correct and produces exact
same results.  But I also am skeptical.  Anyone else feel like
convincing themselves as well please?

src/hb-array.hh

@@ -330,9 +330,7 @@ struct hb_sorted_array_t :
 	  break;
 
 	case HB_BFIND_NOT_FOUND_STORE_CLOSEST:
-	  if (max < 0 || (max < (int) this->length && array[max].cmp (x) > 0))
-	    max++;
-	  *i = max;
+	  *i = min;
 	  break;
       }
     }