Don't format before linting on Travis

[johnbillion]

When the lint:php job runs on Travis, the code is formatted (with phpcbf) before it's linted. This defeats the point of linting as it means problems that can be fixed with phpcbf get missed.

Ref: https://core.trac.wordpress.org/browser/tags/5.3.2/.travis.yml?marks=124-125#L110

Introduced in [45799]. @pento Is this intentional or was it something temporary that was supposed to be removed at a later date?

[pento]

IIRC, phpcbf will return an error value if it makes any changes, so the subsequent phpcs commands won't be run. This was probably done for performance.

The composer format can probably be removed, I have no strong feelings either way on it.

[johnbillion]

In 47741:

Build/Test Tools: Remove unnecessary formatting before linting on Travis CI.

Fixes #49722

[desrosj]

Referenced in the following dev note: ​https://make.wordpress.org/core/2020/07/14/php-related-improvements-changes-wordpress-5-5-edition/.