hww: smarter auto-selection of which device to pair with

scenario1:
- 2of2 multisig wallet with trezor1 and trezor2 keystores
- only trezor2 connected
- previously we would pair first keystore with connected device and then display error.
  now we will pair the device with the correct keystore on the first try

scenario2:
- standard wallet with trezor1 keystore
- trezor2 connected (different device)
- previously we would pair trezor2 with the keystore and then display error.
  now we will prompt the user to select which device to pair with (out of one)

related: #5789

electrum/plugins/keepkey/keepkey.py

@@ -179,10 +179,11 @@ class KeepKeyPlugin(HW_PluginBase):
 
         return client
 
-    def get_client(self, keystore, force_pair=True) -> Optional['KeepKeyClient']:
-        devmgr = self.device_manager()
-        handler = keystore.handler
-        client = devmgr.client_for_keystore(self, handler, keystore, force_pair)
+    def get_client(self, keystore, force_pair=True, *,
+                   devices=None, allow_user_interaction=True) -> Optional['KeepKeyClient']:
+        client = super().get_client(keystore, force_pair,
+                                    devices=devices,
+                                    allow_user_interaction=allow_user_interaction)
         # returns the client for a given keystore. can use xpub
         if client:
             client.used()