card10.cfg offsets not calculated correctly after string length changes

Steps taken:

• Delete card10.cfg
• Reboot
• Open BLE app
• Enable BLE
• Make BLE app default
• Open BLE app
• Make g_watch default
• Open BLE app
• Pair iDevice
• Read config

>>> open("card10.cfg").read()
'\nble_enable = true\n\nble_mac = ca:4d:10:42:09:11\n\ndefault_app =/apps/g_watch/__init__.py\n\ntimezone = +0200\n'
>>> import config
>>> config.get_string("timezone")
'e = +0200'
>>>