[TASK] Add missing "Returns" to a test name

In Tx_Phpunit_Service_DatabaseTest, the test function name
"selectMySqliResult" was missing the "Returns".

Resolves: #57840

Change-Id: Id4f817cf87415ea3821fb606ec33e620fd868259
Reviewed-on: https://review.typo3.org/29384
Reviewed-by: Oliver Klee
Tested-by: Oliver Klee