Remove wildcard flags not present in busybox that crash the MM import

After migrating to stack-build-agent, build began to fail due to --wildcard flag on the tar command. In busybox, which is the shell impl used in the build agent, this flag is not present and causes errors. As we already have cleanup, this won't make the build image any larger but will result in slightly longer and larger intermediate images as it extracts a few extra files.