fix qrscanner module

plugins/qrscanner.py

@@ -81,7 +81,7 @@ def parse_uri(uri):
 
 
 def fill_from_qr(self):
-    qrcode = qrscanner.scan_qr()
+    qrcode = scan_qr()
     if 'address' in qrcode:
         self.payto_e.setText(qrcode['address'])
     if 'amount' in qrcode:
@@ -93,7 +93,7 @@ def fill_from_qr(self):
                 
 
 def create_send_tab(gui, grid):
-    if qrscanner.is_available():
+    if is_available():
         b = QPushButton(_("Scan QR code"))
         b.clicked.connect(lambda: fill_from_qr(gui))
         grid.addWidget(b, 1, 5)