Fix 'tuple' object has no attribute 'copy'

Occurred when switching interfaces and there were unanswered
requests that need resending.  This bug isn't new; it's been
there since at least 3rd June.

lib/interface.py

@@ -243,8 +243,6 @@ class Interface:
 
     def queue_request(self, request):
         '''Queue a request.'''
-        if type(request) != type({}):
-            traceback.print_exc(file=sys.stderr)
         self.request_time = time.time()
         self.unsent_requests.append(request)
 

lib/network.py

@@ -261,7 +261,7 @@ class Network(util.DaemonThread):
         self.cached_responses = {}
         self.print_error('sending subscriptions to', self.interface.server, len(self.unanswered_requests), len(self.subscribed_addresses))
         for r in self.unanswered_requests.values():
-            self.interface.queue_request(r)
+            self.interface.queue_request(r[0])
         for addr in self.subscribed_addresses:
             self.queue_request('blockchain.address.subscribe', [addr])
         self.queue_request('server.banner', [])