Don’t preload blop sound

(Service Worker will preload it)

client/index.html

@@ -178,7 +178,7 @@
     <script src="scripts/network.js"></script>
     <script src="scripts/ui.js"></script>
     <!-- Sounds -->
-    <audio id="blop" preload="auto" autobuffer="true">
+    <audio id="blop" autobuffer="true">
         <source src="/sounds/blop.mp3" type="audio/mpeg">
         <source src="/sounds/blop.ogg" type="audio/ogg">
     </audio>