issue #3296192 by Dharti Patel: PHPCS Coding Standards Issue

Hi, I applied 3296192-updating-cs-10.patch and found coding standard errors remaining, so I just worked on them. About the README file, there is no need to fix its coding standards issues because it has a structure defined to explain all about the module. Now there are 2 coding standards errors remaining which need some clarification before work on them:

FILE: /-------/------/------/-------/-------/-------/modules/contrib/image_effects/tests/src/Functional/SettingsFormTest.php

FOUND 1 ERROR AFFECTING 1 LINE

97 | ERROR | Method name "SettingsFormTest::__testJqueryColorpickerSelector" is invalid; only PHP magic methods should be prefixed with a double underscore

FILE: /---/---/---/---/---/---/modules/contrib/image_effects/tests/src/Functional/Effect/RotateTest.php

FOUND 0 ERRORS AND 3 WARNINGS AFFECTING 3 LINES

258 | WARNING | Unused private method setFuchsia() 275 | WARNING | Unused private method setTransparent() 294 | WARNING | Unused private method shift90()