transaction: don't convert p2pk to p2pkh address when displaying

also closes #4742

electrum/plugins/greenaddress_instant/qt.py

@@ -34,7 +34,6 @@ from electrum.plugin import BasePlugin, hook
 from electrum.i18n import _
 
 
-
 class Plugin(BasePlugin):
 
     button_label = _("Verify GA instant")
@@ -49,9 +48,9 @@ class Plugin(BasePlugin):
     def get_my_addr(self, d):
         """Returns the address for given tx which can be used to request
         instant confirmation verification from GreenAddress"""
-        for addr, _ in d.tx.get_outputs():
-            if d.wallet.is_mine(addr):
-                return addr
+        for o in d.tx.outputs():
+            if d.wallet.is_mine(o.address):
+                return o.address
         return None
 
     @hook