fix: replace removed get_seed call in PSBTSelectSeedView

Co-authored-by: Nick Klockenga <127377+newtonick@users.noreply.github.com>

src/seedsigner/views/psbt_views.py

@@ -58,7 +58,7 @@ class PSBTSelectSeedView(View):
 
         if len(seeds) > 0 and selected_menu_num < len(seeds):
             # User selected one of the n seeds
-            self.controller.psbt_seed = self.controller.get_seed(selected_menu_num)
+            self.controller.psbt_seed = seeds[selected_menu_num]
             return Destination(PSBTOverviewView)
         
         # The remaining flows are a sub-flow; resume PSBT flow once the seed is loaded.

tests/test_flows_psbt.py

@@ -57,6 +57,18 @@ class TestPSBTFlows(FlowTest):
             FlowStep(MainMenuView)
         ])
 
+        # Run the same PSBT flow again, this time selecting the seed that the
+        # previous flow left loaded in memory.
+        self.run_sequence([
+            FlowStep(MainMenuView, button_data_selection=MainMenuView.SCAN),
+            FlowStep(scan_views.ScanView, before_run=load_psbt_into_decoder),
+            FlowStep(psbt_views.PSBTSelectSeedView, screen_return_value=0),
+            FlowStep(psbt_views.PSBTOverviewView),
+        ])
+
+        # Selecting the existing seed should have set it as the signing seed
+        assert self.controller.psbt_seed is self.controller.storage.seeds[0]
+
 
     def test_scan_psbt_first_then_load_electrum_seed(self):
         """