Fix posix scripts to preserve arguments with spaces

[arrowmaster]

The wrapper scripts are mangling any arguments with spaces and passing them on as multiple arguments. This is known to cause any game installed to a path with a space in it to fail to launch. Improper argument parsing can be a serious issue and this could cause additional bugs in the future if not fixed.

This preserves the arguments while only striping out the options the wrapper script is checking for. The start_game_bepinex.sh script may also need to be updated and I'm working with the BepInExPack for Valheim team on this. I don't know what other games use a start_game_bepinex.sh script and if they would need updated too.

[CLAassistant]

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[arrowmaster]

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[ebkr]

As discussed, the comment above agrees to the CLA. I've taken a screenshot to keep a record of it.

[ebkr]

Thanks for the PR - All tested and working as expected on a profile with and without spaces!