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/dokick.c

@@ -411,7 +411,7 @@ container_impact_dmg(
     struct monst *shkp;
     struct obj *otmp, *otmp2;
     long loss = 0L;
-    boolean costly, insider, frominv;
+    boolean costly, insider, frominv, wchange = FALSE;
 
     /* only consider normal containers */
     if (!Is_container(obj) || !Has_contents(obj) || Is_mbag(obj))
@@ -462,8 +462,11 @@ container_impact_dmg(
             }
             /* contents of this container are no longer known */
             obj->cknown = 0;
+            wchange = TRUE;
         }
     }
+    if (wchange)
+        obj->owt = weight(obj);
     if (costly && loss) {
         if (!insider) {
             You("caused %ld %s worth of damage!", loss, currency(loss));

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;
 }
 

src/nhlobj.c

@@ -129,6 +129,7 @@ l_obj_add_to_container(lua_State *L)
         lo->obj = otmp;
         lo->obj->lua_ref_cnt += refs;
     }
+    lobox->obj->owt = weight(lobox->obj);
 
     return 0;
 }

src/timeout.c

@@ -1118,6 +1118,7 @@ hatch_egg(anything *arg, long timeout)
             /* still some eggs left */
             /* Instead of ordinary egg timeout use a short one */
             attach_egg_hatch_timeout(egg, (long) rnd(12));
+            egg->owt = weight(egg);
         } else if (carried(egg)) {
             useup(egg);
         } else {