PinetimeJFDevice::information returning empty string

[jmlich]

The service() function expects service uuid instead of characteristics uuid. As a consequence the information() function returns empty QString() instead of expected value. The function is called in Component.onCompleted of StepsPage, this sets _InfoSteps to "" and user can see 0 on the FirstPage

Steps to reproduce:

• open application, there is non-zero number of the FirstPage
• go to StepsPage and back
• Number of steps should be non-zero number