Fix some object weight problems

There were few places where the object weight was not updated:

- container when the contents were broken by impact
- starting to eat but getting stopped by rotten food
- using lua, container when putting an object inside it
- when a single egg of a larger stack hatched

src/eat.c

@@ -2950,6 +2950,8 @@ doeat(void)
 
     if (!dont_start)
         start_eating(otmp, already_partly_eaten);
+    else
+        otmp->owt = weight(otmp);
     return ECMD_TIME;
 }