fix(voxel_grid_covariance_omp): remove cin in radius search (#69)

[kimurariku]

PR Type

• Improvement

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Description

The purpose of this PR is to ensure std:cin will not be called every time running radiusSearch in ndt_omp

Review Procedure

Contents already discussed in this PR

This PR has merged 5972635 from x1eve/beta/v0.0.0
The commit e0901d9 of this PR is converted to 5972635 when it was merged.

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