be less strict when figuring out major version in initrd

[evgeni]

We only care for the major part of the version, so it's sufficient to grep without the dot, which is not present on CentOS initrd.

CentOS Stream 8:

VERSION="8 dracut-049-224.git20230330.el8"
VERSION_ID=049-224.git20230330.el8

CentOS Stream 9:

VERSION="9 dracut-057-38.git20230725.el9"
VERSION_ID="9"

RHEL 8.8:

VERSION="8.8 (Ootpa) dracut-049-223.git20230119.el8"
VERSION_ID=049-223.git20230119.el8

RHEL 9.2:

VERSION="9.2 (Plow) dracut-057-21.git20230214.el9"
VERSION_ID="9.2"

Ideally, we would just use the major part of VERSION_ID, but this is set to the underlying OS'es VERSION_ID only since dracut 050 [1] and EL8 ships with 049.

[1] https://github.com/dracutdevs/dracut/commit/72ae1c4fe73c5637eb8f6843b9a127a6d69469d6

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[fernflower]

I guess it's good to go. Thanks for the contribution!