Fix NameError in pin_lock.py: change process_name to process

Author: robtaylor

chipflow_lib/pin_lock.py

@@ -163,7 +163,7 @@ def lock_pins() -> None:
                 _map, _ = allocate_pins(k, v, pins)
                 port_map.add_ports(component, k, _map)
 
-    newlock = LockFile(process=process_name,
+    newlock = LockFile(process=process,
                        package=package,
                        port_map=port_map,
                        metadata=interfaces)