When exporting chapters, timestamps over 24hrs revert bac to 0 hours

[Ted]

If a chapter is more than 24 hours in, exporting the chapters leads to the chapter being marked as 0 hours. 25 hours in will be 1 hours. 26 hours, 2 hours etc. If the text file is manually edited to fix the incorrect timestamps, Subler then imports the chapters just fine.

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[Damiano Galassi]

Duplicate of #710.