Administration: Fix failing tests as a result of [48397].

Because of changes to how PHP handles arrays used in `foreach()` loops in PHP >= 7.0, [48397] resulted in a failing test for PHP 5.6.

This calls `reset()` after using the `$results` array in the `foreach()` to ensure the array is treated the same and as expected.

Props azaozz, desrosj, SergeyBiryukov, xknown.
See #50448.
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git-svn-id: https://core.svn.wordpress.org/trunk@48170 1a063a9b-81f0-0310-95a4-ce76da25c4cd