#153 Only try and sync if the target time is less than the video length

[sighmon]

Resolves #153

Fix media player syncing for Raspberry Pis by only trying to sync if the target time is less than the video length.

Acceptance Criteria

• [x] Only try and sync if the target time is less than the video length

Relevant design files

• None

Testing instructions

1. Break the download of a video on a media player client
2. Set it up to sync, and note that it doesn't skip if it can't sync

DoD

For requester to complete:

• [x] All acceptance criteria are met
• ~[ ] New logic has been documented~
• ~[ ] New logic has appropriate unit tests~
• ~[ ] Changelog has been updated if necessary~
• ~[ ] Deployment / migration instruction have been updated if required~