python3: remove calls to unicode function

lib/mnemonic.py

@@ -86,10 +86,7 @@ def is_CJK(c):
 
 def normalize_text(seed):
     # normalize
-    if six.PY2:
-        seed = unicodedata.normalize('NFKD', unicode(seed))
-    else:
-        seed = unicodedata.normalize('NFKD', str(seed))
+    seed = unicodedata.normalize('NFKD', str(seed))
     # lower
     seed = seed.lower()
     # remove accents

lib/storage.py

@@ -85,12 +85,6 @@ class WalletStorage(PrintError):
             except Exception as e:
                 raise IOError("Cannot read wallet file '%s'" % self.path)
             self.data = {}
-            # In old versions of Electrum labels were latin1 encoded, this fixes breakage.
-            for i, label in labels.items():
-                try:
-                    unicode(label)
-                except UnicodeDecodeError:
-                    d['labels'][i] = unicode(label.decode('latin1'))
             for key, value in d.items():
                 try:
                     json.dumps(key)

lib/websockets.py

@@ -114,7 +114,7 @@ class WsClientThread(util.DaemonThread):
                 for ws, amount in l:
                     if not ws.closed:
                         if sum(result.values()) >=amount:
-                            ws.sendMessage(unicode('paid'))
+                            ws.sendMessage('paid')