Fix runtime fallback for calculating episode progress

[ZelKami]

• Kodi handles episode runtimes in seconds
• This addon fetches episode runtimes from Trakt as fallback to avoid multiplying the progress percentage with 0
• Trakt stores and returns runtimes in minutes and this addon did not account for that which led to issues, see Resume issue with tv shows #571
• This fix converts the Trakt runtime to seconds by multiplying it with 60, which resolves the issue

[razzeee]

Hey, sounds good, did you runtime test it?

[razzeee]

This also raises the question, if the conversion needs to happen for movies too.

[ZelKami]

I've only tested it on my Kodi setup.

For movies there seems to be no fallback to the Trakt runtime

[razzeee]

Can you rebase this?