Fix unit test to run on alfred20 (mariadb 10.3) and on alfred 16 (mariadb 10.1)

Documentation/Form.rst

Documentation/Installation.rst

Documentation/Report.rst

Documentation/Variable.rst

extension/Classes/Core/Database/DatabaseUpdateData.php

extension/Classes/Core/Helper/EncryptDecrypt.php

extension/Classes/Core/Helper/OnString.php

extension/Classes/Core/Save.php

extension/Tests/Unit/Core/BuildFormPlainTest.php

extension/Tests/Unit/Core/EvaluateTest.php

extension/Tests/Unit/Core/Helper/EncryptDecryptTest.php

extension/Tests/Unit/Core/Store/StoreTest.php