cosigner pool: easy fix (works but with worse than previous behaviour)

got broken as part of PSBT changes in #5721

electrum/plugins/cosigner_pool/qt.py

@@ -164,12 +164,10 @@ class Plugin(BasePlugin):
             d.cosigner_send_button.setVisible(False)
 
     def cosigner_can_sign(self, tx: Transaction, cosigner_xpub: str) -> bool:
-        if not isinstance(tx, PartialTransaction):
-            return False
-        if tx.is_complete():
-            return False
-        # TODO this is broken currently as it assumes tx.xpubs
-        return cosigner_xpub in {bip32node.to_xpub() for bip32node in tx.xpubs}
+        # TODO implement this properly:
+        #      should return True iff cosigner (with given xpub) can sign and has not yet signed.
+        #      note that tx could also be unrelated from wallet?... (not ismine inputs)
+        return True
 
     def do_send(self, tx: Union[Transaction, PartialTransaction]):
         def on_success(result):