kivy: simplify parse_URI

gui/kivy/main_window.py

@@ -232,7 +232,7 @@ class ElectrumWindow(App):
         try:
             url = electrum.util.parse_URI(url, self.on_pr)
         except:
-            self.show_info("Invalid URI", url)
+            self.show_info(_("Not a Bitcoin URI") + ':\n', url)
             return
         self.send_screen.set_URI(url)
 

gui/kivy/uix/screens.py

@@ -230,12 +230,7 @@ class SendScreen(CScreen):
         if not contents:
             self.app.show_info(_("Clipboard is empty"))
             return
-        try:
-            uri = parse_URI(contents)
-        except:
-            self.app.show_info(_("Clipboard content is not a Bitcoin URI"))
-            return
-        self.set_URI(uri)
+        self.app.set_URI(contents)
 
     def do_send(self):
         if self.payment_request: