fix(voxel_grid_covariance_omp): remove cin in radius search

[BaronYSYong]

Description

Why

• To ensure std:cin will not be called every time running radiusSearch in ndt_omp

What

• Remove std:cin from radiusSearch in ndt_omp

Related links

• https://tier4.atlassian.net/browse/AEAP-1682
• https://tier4.atlassian.net/browse/AEAP-1792

Tests performed

• The only changes in this PR is to remove std:cin in radiusSearch, which will not affect functionality and performance of localization.
• From the simulation, the vehicle is moving properly without any emergency error.

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[peeeechi]

Thank you for your response. LGTM! !
I approve

[1222-takeshi]

LGTM
FYI related PR