add a color pair for qr code

gui/text.py

@@ -35,6 +35,7 @@ class ElectrumGui:
         curses.use_default_colors()
         curses.init_pair(1, curses.COLOR_WHITE, curses.COLOR_BLUE)
         curses.init_pair(2, curses.COLOR_WHITE, curses.COLOR_CYAN)
+        curses.init_pair(3, curses.COLOR_BLACK, curses.COLOR_WHITE);
         self.stdscr.keypad(1)
         self.stdscr.border(0)
         self.maxy, self.maxx = self.stdscr.getmaxyx()
@@ -181,12 +182,12 @@ class ElectrumGui:
         s = StringIO.StringIO()
         self.qr = qrcode.QRCode()
         self.qr.add_data(data)
-        self.qr.print_ascii(out=s, invert=True)
+        self.qr.print_ascii(out=s, invert=False)
         msg = s.getvalue()
         lines = msg.split('\n')
         for i, l in enumerate(lines):
             l = l.encode("utf-8")
-            self.stdscr.addstr(i+5, 5, l)
+            self.stdscr.addstr(i+5, 5, l, curses.color_pair(3))
 
     def print_list(self, list, firstline = None):
         self.maxpos = len(list)