Fix a PHP fatal error with the log_sync function

[dkotter]

Description of the Change

In the latest Distributor release, we added an optional parameter to the log_sync method that is used to overwrite the log. The base method we extended had a type declaration on that optional value to bool but the two places we extended this method didn't have that same type declaration. In PHP versions 7.0 and 7.1, this will cause a fatal error to be thrown because those function signatures don't match.

In addition, PHP 5.6 does not support scalar type declarations, which bool is considered a scalar type. Because we still support PHP 5.6, this PR removes the bool type declaration so no errors will happen in 5.6, 7.0 or 7.1.

Alternate Designs

None

Benefits

No PHP fatals on PHP version <7.2

Possible Drawbacks

None

Verification Process

• Install the latest version of Distributor on a site running PHP <7.2
• Should get a fatal error
• Checkout this PR in same environment
• Everything should work now

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

Applicable Issues

Fixes #734. Related #735

[helen]

LGTM