trim Proton beta and rc versioning (fixes #1094)

[VoodooHillbilly]

When ONLYPROTMAJORREDIRECT is enabled, beta and release candidate versioning will not be included in new Proton compatdata names.

[sonic2kk]

Did a quick test with this patch applied locally, works as expected based on discussion in #1094.

Tested with "Halo: The Master Chief Collection" and a global compatdata redirect with ONLYPROTMAJORREDIRECT=1, and it created compatdata-proton-9.0 at ~/.config/steamtinkerlaunch/proton/compatdata/ as expected.

As you mentioned in #1094 (comment), there is indeed no longer a Proton Beta or Release Candidate to test with here. However, I tested this in a Bash prompt with the following, and it returned the correct trimming results.

function trimProtBetaRC {
    printf '%s' "${1}" | sed -e 's/-\(rc\|beta\)[0-9]\+$//' -e 's/-[0-9A-Za-z_]\+$//'
}

# proton-8.0
trimProtBetaRC "proton-8.0-3c"

# proton-9.0
trimProtBetaRC "proton-9.0-1"

# proton-9.0
trimProtBetaRC "proton-9.0-1-rc2"

# This was a sneaky one ;-)
# proton-10.0
trimProtBetaRC "proton-10.0-beta16"

# GE-Proton9
trimProtBetaRC "GE-Proton9-4"

This looks good to merge to me. Thanks!

[sonic2kk]

Changelog has been updated to give credit for this change, under "Fixes": https://github.com/sonic2kk/steamtinkerlaunch/wiki/Changelog

Thanks again!

[VoodooHillbilly]

And... I forgot to edit my commit message to match the edited PR message. Oh well, at least I finally managed to make the PR. Maybe it'll help next time there's a beta/rc version.

[sonic2kk]

It's all good :-)