Fix resetting and initial die quantity

dice/index.html

@@ -37,7 +37,7 @@
             </div>
         </div>
         <div class="center_field">
-            <input type="text" id="set" value="4d6"></input><br/>
+            <input type="text" id="set" value=""></input><br/>
             <button id="clear">clear</button>
             <button style="margin-left: 0.6em" id="throw">throw</button>
         </div>

dice/main.js

@@ -26,7 +26,8 @@ function diceInitialize(container, w, h) {
 
     $t.bind($t.id('clear'), ['mouseup', 'touchend', 'touchcancel'], function(ev) {
         ev.stopPropagation();
-        set.value = '0';
+        set.dataset.fullDieProps = "";
+        set.value = '';
         onSetChange();
     });