Fix rewriting rules default site conf - see linuxserver/docker-cops#31

[mikespub]

• I have read the contributing guideline and understand that I have made the correct modifications

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Description:

Fix rewriting rules in default site conf according to COPS guidelines - see https://github.com/seblucas/cops/wiki/Url-Rewriting-with-COPS

Benefits of this PR and context:

Fix downloading or viewing a book with any e-reader having difficulties fetching books from /fetch?php?data=1&type=epub links like Kobo, Moon+ Reader etc.

Closes issue #31 and replaces PR #33

How Has This Been Tested?

Enable url rewriting in COPS config_local.php file

$config['cops_use_url_rewriting'] = "1";

Source / References:

See https://github.com/seblucas/cops/wiki/Url-Rewriting-with-COPS

[github-actions]

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[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/cops/2.5.6-pkg-4e338e49-dev-efe5296e70fc25325e7ad843c1798ce0c8bb1a3f-pr-52/index.html
https://ci-tests.linuxserver.io/lspipepr/cops/2.5.6-pkg-4e338e49-dev-efe5296e70fc25325e7ad843c1798ce0c8bb1a3f-pr-52/shellcheck-result.xml

Tag	Passed
amd64-2.5.6-pkg-4e338e49-dev-efe5296e70fc25325e7ad843c1798ce0c8bb1a3f-pr-52	✅
arm64v8-2.5.6-pkg-4e338e49-dev-efe5296e70fc25325e7ad843c1798ce0c8bb1a3f-pr-52	✅

[aptalca]

Thanks for the PR 👍