Fix: Fix several bugs in KEDF get_energy functions

[sunliang98]

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Linked Issue

Fix #...

Unit Tests and/or Case Tests for my changes

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What's changed?

These functions are currently unused, but this PR corrects the issues to ensure they work properly when called in the future.

Any changes of core modules? (ignore if not applicable)

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[Copilot]

Pull request overview

Fixes several KEDF-related get_energy implementations so the returned value matches the reduced/stored member energy, and makes small ML-related output/formatting adjustments to improve correctness/consistency when these codepaths are used in the future.

Changes:

• Return reduced member energy (this->*_energy) from multiple KEDF get_energy functions instead of returning the unreduced local energy.
• Add braces around if (PARAM.inp.of_ml_feg == 1) in ML KEDF / ML EXX parameter setup for clearer, safer control flow.
• Adjust ML descriptor output pathing for p.npy (currently introduces a path-join bug; see comment).

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
source/source_pw/module_ofdft/kedf_xwm.cpp	Return reduced xwm_energy from get_energy.
source/source_pw/module_ofdft/kedf_wt.cpp	Return reduced wt_energy from get_energy.
source/source_pw/module_ofdft/kedf_vw.cpp	Return reduced vw_energy from get_energy.
source/source_pw/module_ofdft/kedf_tf.cpp	Return reduced tf_energy from get_energy.
source/source_pw/module_ofdft/kedf_lkt.cpp	Return reduced lkt_energy from get_energy.
source/source_pw/module_ofdft/kedf_ml.cpp	Add braces around ML-FEG softplus branch in set_para.
source/source_io/module_ml/write_mlkedf_descriptors.cpp	Change p.npy output path to use out_dir (currently missing /).
source/source_estate/module_pot/pot_ml_exx.cpp	Add braces around ML-FEG softplus branch in set_para.

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[mohanchen]

LGTM