Don't reset text in accept_handler (prompt_toolkit change).

Author: jonathanslenders

ptpython/python_input.py

@@ -257,6 +257,7 @@ def _accept_handler(self, buff):
         app = get_app()
         app.exit(result=buff.text)
         app.pre_run_callables.append(buff.reset)
+        return True  # Keep text, we call 'reset' later on.
 
     @property
     def option_count(self):