metadatum: remove deleted move operations

[neheb]

These are already deleted. No need to be explicit.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.87%. Comparing base (2e6fb08) to head (fbd717f).
Report is 54 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3272      +/-   ##
==========================================
- Coverage   63.91%   63.87%   -0.04%     
==========================================
  Files         104      104              
  Lines       21752    21698      -54     
  Branches    10636    10626      -10     
==========================================
- Hits        13903    13860      -43     
+ Misses       5641     5632       -9     
+ Partials     2208     2206       -2     

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