fix(preload): Use standard Python module names

preload/apps/adventure_timer/__init__.py

preload/apps/analog_clock/__init__.py

preload/apps/ble/__init__.py

preload/apps/bme680_sensor_demo/__init__.py

preload/apps/card10_nickname/__init__.py

preload/apps/digiclk/__init__.py

preload/apps/digiclk/monotime.py

preload/apps/ecg/__init__.py

preload/apps/lsd_nickname/__init__.py

preload/apps/scope/__init__.py

preload/apps/text_reader/__init__.py

preload/menu.py