Fix getdifficulty

lib/explorer.js

@@ -130,7 +130,7 @@ module.exports = {
 
   get_difficulty: function(cb) {
     if (settings.use_rpc) {
-      client.cmd([{method:'getdifficulty', params: [parseInt(height)]}], function(err, response){
+      client.cmd([{method:'getdifficulty', params: []}], function(err, response){
         if (err)
           return cb('There was an error. Check your console.');
         else

routes/index.js

@@ -281,7 +281,7 @@ router.get('/qr/:string', function(req, res) {
 
 router.get('/ext/summary', function(req, res) {
   lib.get_difficulty(function(difficulty) {
-    difficultyHybrid = ''
+    difficultyHybrid = '';
     if (difficulty['proof-of-work']) {
       if (settings.index.difficulty == 'Hybrid') {
         difficultyHybrid = 'POS: ' + difficulty['proof-of-stake'];