Syle-based refactor

Author: kmvanbrunt

cmd2/cmd2.py

@@ -3563,8 +3563,8 @@ def set_window_title(self, title: str) -> None:  # pragma: no cover
             except AttributeError:
                 # Debugging in Pycharm has issues with setting terminal title
                 pass
-
-            self.terminal_lock.release()
+            finally:
+                self.terminal_lock.release()
 
         else:
             raise RuntimeError("another thread holds terminal_lock")