Explicitly set buffer=0.4.

[joaander]

Description

Set buffer=0.4 in all neighbor list initialization lines. The next HOOMD v3 beta release requires that users set this parameter (see https://github.com/glotzerlab/hoomd-blue/issues/1147).

Checklist:

• [x] I have reviewed the Contributor Guidelines.
• [x] I agree with the terms of the HOOMD-blue Contributor Agreement.
• [x] My name is on the list of authors.

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[joaander]

pre-commit passes locally. I don't know why pre-commit.ci is stalled.

[joaander]

@b-butler Do you approve the new changes?