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Fix scf_ppcg GPU case: remove k-point-incompatible use_k_continuity
The case was copied from scf_bpcg and inherited use_k_continuity, which cannot be used with k-point parallelization (the default for the 2-process run without bndpar). Drop use_k_continuity and diago_smooth_ethr, matching the other GPU solver cases, and regenerate the reference with mpirun -np 2.
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‎tests/11_PW_GPU/scf_ppcg/INPUT‎

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@@ -32,5 +32,3 @@ mixing_beta 0.4
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mixing_gg0 1.5
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pw_seed 1
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diago_smooth_ethr 1
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use_k_continuity 1

‎tests/11_PW_GPU/scf_ppcg/result.ref‎

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etotref -4869.7470516888497514
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etotperatomref -2434.8735258444
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totalforceref 5.204732
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totalstressref 37241.882220
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etotref -4869.7470517268475305
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etotperatomref -2434.8735258634
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totalforceref 5.206812
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totalstressref 37241.543010
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pointgroupref C_1
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spacegroupref C_1
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nksibzref 8
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totaltimeref 4.39
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totaltimeref 4.30

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