OS (Linux): prioritize prettyName over name

[xbt573]

PR title pretty much says all about changes in code. Currently fastfetch uses os-release's name over prettyName, which are not always equal (for example Gentoo's name is Gentoo, but prettyName is Gentoo Linux)

This change just swaps order of name and prettyName in if-else if-else chain

[CarterLi]

This PR is known to break alpine linux and debian.

The pretty name of apline linux is Alpine Linux v3.20 while its version is 3.20.0, which results in OS: Alpine Linux v3.20 3.20.0 aarch64

It may also break debian. We fetch point release version of debian in /etc/debian_version, while the pretty name of debian contains only the major version. so that fastfetch will print Debian GNU/Linux 12 (bookworm) 12.1 x86_64. See dylanaraps/neofetch#2381

[CarterLi]

Fastfetch uses NAME instead of PRETTY_NAME to generate more constant and accurate results. Unless this change gets tested in every linux distro, I want the old behavior being kept

[xbt573]

I tested some popular distros with docker (and my own Gentoo), and i can categorize the results into some categories:

1. Everything is okay, name equals prettyName: Arch Linux, Clear Linux
2. Everything is okay, prettyName contains version_id (version duplication prevented by condition): Fedora, RockyLinux
3. Patch did output better: Alt Linux (Alt name is "starter kit"), Alma Linux (codename added, version duplication prevented by condition), Amazon Linux (version from prettyName is more verbose), Gentoo Linux
4. Broken: Alpine Linux, Ubuntu Linux, Debian Linux

I propose these solutions:

1. Introduce some sort of exception list, and use name over prettyName if exception list contains name
2. Fuzzy version contains: Allow matching version in prettyName by parts, will help with v3.20-3.20.0 and similar, harder
3. Don't include version if prettyName is used, radical but most of distros specify version in prettyName (8 of 11 tested, 2 is rolling)

I'm ready to assist with every solution you choose and test all fastfetch supported distros (by logo) if needed.

If none of solutions is suitable then just close this PR

[CarterLi]

I would rather fix the name and version.

For example: test if prettyName contains name + " Linux"