Timestamp reported incorrectly in the bluetoothPairedReg module

[Johann-PLW]

A user reported that "Last Seen Time" timestamps were being incorrectly displayed in HTML, TSV, Timeline and Lava output.
The problem was identified.

In the com.apple.MobileBluetooth.devices.plist file, timestamps are stored in local time (time zone of the device at that time).
iLEAPP used an incorrect datetime conversion function that converted the extracted value to the time zone of the computer running it.

This was fixed.
iLEAPP uses now the convert_unix_ts_to_str fonction to convert the unix timestamp to a string without applying any timezone offset.