fix: ijepa example

[vectorvp]

Resolves #1712

Moved apply_masks together with repeat_interleave_batch to utils.py from lightly/models/modules/ijepa_timm.py.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.23%. Comparing base (1e7274a) to head (9fa4820).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1747   +/-   ##
=======================================
  Coverage   85.22%   85.23%           
=======================================
  Files         162      162           
  Lines        6729     6731    +2     
=======================================
+ Hits         5735     5737    +2     
  Misses        994      994           

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[guarin]

Thanks for the PR! I updated the docstrings to match our format but otherwise everything LGTM :)