Bug in _compute_dense_tracks

[jinlinyi]

Hi Yuxi,

Thanks for releasing this great project. The depth_predictor and video_depth variables are not used here, which causes error when using _compute_dense_tracks.

https://github.com/henry123-boy/SpaTracker/blob/0fcc1ad75bdd14ce4d2946d33630fac63e023fdd/models/spatracker/predictor.py#L100-L105

Additional request -- when you push new commits, could you just push without rebase? Otherwise it is hard for me to sync up my code with your latest change. Thank you!

Best, Linyi