Proposed changes

https://cdash.qmcpack.org/tests/4512639

Fix occasional failure in DMC kinetic energy test.

Tests for series 1
  Testing quantity: Kinetic
    reference mean value     :  11.48570000
    reference error bar      :   0.02310000
    computed  mean value     :  11.55687790
    computed  error bar      :   0.02252998
    pass tolerance           :   0.06930000  (  3.00000000 sigma)
    deviation from reference :   0.07117790  (  3.08129424 sigma)
    error bar of deviation   :   0.03226778
    significance probability :   0.99793883  (gaussian statistics)
    status of this test      :   fail

Test status: fail

What type(s) of changes does this code introduce?

• Testing changes (e.g. new unit/integration/performance tests)

Does this introduce a breaking change?

• No

What systems has this change been tested on?

None

Checklist

Update the following with a yes where the items apply. If you're unsure about any of them, don't hesitate to ask. This is
simply a reminder of what we are going to look for before merging your code.

• Yes. This PR is up to date with current the current state of 'develop'
• NA. Code added or changed in the PR has been clang-formatted
• NA. This PR adds tests to cover any new code, or to catch a bug that is being fixed
• NA. Documentation has been added (if appropriate)