remove duplicate header in fairchem-data-om/pyproject.toml

[IliasChair]

The pyproject.toml file from the fairchem-data-om package contains two instances of the [tool.hatch.build] header. This causes the following error when running ruff check:

ruff failed
  Cause: Failed to parse fairchem/packages/fairchem-data-om/pyproject.toml
  Cause: TOML parse error at line 33, column 1
   |
33 | [tool.hatch.build]
   | ^
invalid table header
duplicate key `build` in table `tool.hatch`

Kept the first header and directory, since ../../dist-data-om matches as the other package configurations.

[rayg1234]

@lbluque can you take a quick look?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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[lbluque]

Thanks @IliasChair !