Simplify vase-dropping logic using state_change().

actions.c

@@ -502,10 +502,9 @@ static int discard(token_t verb, token_t obj, bool just_do_it)
                    game.loc == objects[PILLOW].plac) {
             rspeak(OK_MAN);
         } else {
-            game.prop[VASE] = VASE_BROKEN;
-            if (AT(PILLOW))
-                game.prop[VASE] = VASE_WHOLE;
-            pspeak(VASE, look, game.prop[VASE] + 1, true);
+	    state_change(VASE, AT(PILLOW)
+			 ? VASE_WHOLE
+			 : VASE_DROPPED);
             if (game.prop[VASE] != VASE_WHOLE)
                 game.fixed[VASE] = -1;
         }

adventure.yaml

@@ -3738,15 +3738,14 @@ objects: !!omap
     inventory: 'Ming vase'
     locations: LOC_ORIENTAL
     treasure: true
-    states: [VASE_WHOLE, VASE_RESTING, VASE_BROKEN, VASE_DROPS]
+    states: [VASE_WHOLE, VASE_DROPPED, VASE_BROKEN]
     descriptions:
     - 'There is a delicate, precious, ming vase here!'
-    - 'The vase is now resting, delicately, on a velvet pillow.'
     - 'The floor is littered with worthless shards of pottery.'
-    - 'The ming vase drops with a delicate crash.'
+    - 'The floor is littered with worthless shards of pottery.'
     changes:
-    - ''
-    - ''
+    - 'The vase is now resting, delicately, on a velvet pillow.'
+    - 'The ming vase drops with a delicate crash.'
     - 'You have taken the vase and hurled it delicately to the ground.'
 - EMERALD:
     words: ['emera']