Put cleanup in finally block

As suggested on gh-9867

IPython/terminal/interactiveshell.py

@@ -429,6 +429,7 b' class TerminalInteractiveShell(InteractiveShell):'
                 break
             except KeyboardInterrupt as e:
                 print("\n%s escaped interact()\n" % type(e).__name__)
+            finally:
                 # An interrupt during the eventloop will mess up the
                 # internal state of the prompt_toolkit library.
                 # Stopping the eventloop fixes this, see