Non-public dir support was removed in CMS 5.0.0 - remove dead code

[sabina-talipova]

Description

Changes need to be made to SimpleResourceURLGenerator::resolveModuleResource as Non-public directories are no longer supported in CMS 5. There's a block here that only applies if there's no public directory.

See:

silverstripe-framework/src/Control/SimpleResourceURLGenerator.php

Line 143 in cf78a9d

// @todo Non-public dir support will be removed in 5.0, so remove this block there

Note

We need to consider what happens for usage of framework that isn't using a web server (e.g. pure CLI apps)