added confirm for restart/shutdown ui btns

TODO.txt

@@ -7,5 +7,4 @@
 * ensure accessibility for Onionr web UI
 * make forward secrecy compatible with multiple devices
 * make uptime timer be human meaningful
-* add confirm for shutdown/restart
 * add way to mark key as dead

static-data/www/shared/panel.js

@@ -22,18 +22,22 @@ restartBtn = document.getElementById('restartNode')
 
 shutdownBtn.onclick = function(){
     if (! nowebpass){
+        if (confirm("Really shutdown Onionr?")){
             httpGet('shutdownclean')
             overlay('shutdownNotice')
         }
+    }
 }
 
 restartBtn.onclick = function(){
     if (! nowebpass){
+        if (confirm("Really restart Onionr?")){
             fetch('/restartclean', {
                 headers: {
                 "token": webpass
             }})
             PNotify.notice('Node is restarting')
         }
+    }
 }