Fix octoprint timestamp

[the-kaustubh]

Description

The octoprint services in 'text' mode consumes the octoprint api to show print-job progress. The code converting data to 'mm:ss' format assumed timestamp will be given by the API, instead time in seconds is given. This caused octoprint to show wrong info, I have updated the service to correctly convert from seconds and show progress along with 'Time Left'.
Edit:
Referred following documentation for my fix:
https://docs.octoprint.org/en/master/api/datamodel.html#sec-api-datamodel-jobs-job

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I've read & comply with the contributing guidelines
• I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• I have made corresponding changes to the documentation (README.md).
• I've checked my modifications for any breaking changes, especially in the config.yml file

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[royto]

looks good to me.

Note for future myself: do not review on mobile app late 😄

[the-kaustubh]

@royto I guess you can approve the PR if the changes look ok?

[royto]

I have approved but I'm not maintainer ...