properly clean up after crash

put cleanup in finally block so it happens no matter the crash
this should prevend scrambled lines all over the terminal

botany.py

@@ -622,7 +622,10 @@ if __name__ == '__main__':
     # my_plant is either a fresh plant or an existing plant at this point
     my_plant.start_life()
     my_data.start_threads(my_plant)
+    try:
         botany_menu = CursedMenu(my_plant,my_data)
         my_data.save_plant(my_plant)
         my_data.data_write_json(my_plant)
         my_data.update_garden_db(my_plant)
+    finally:
+        cleanup()

menu_screen.py

@@ -670,7 +670,14 @@ class CursedMenu(object):
 
     def __exit__(self):
         self.exit = True
+        cleanup()
+
+def cleanup():
+    try:
         curses.curs_set(2)
+    except curses.error:
+        # cursor not supported; just ignore
+        pass
     curses.endwin()
     os.system('clear')