themes/oz.elv: fix bad refactor #393

Job	Run time
fresh-macos-test	8m 44s
login-shells-and-linting	5m 56s
distro-test (ubuntu:latest)	3m 0s
homebrew-macos-test	8m 16s
distro-test (fedora:latest)	3m 43s
distro-test (debian:latest)	2m 46s
distro-test (alpine:latest)	5m 55s
distro-test (manjarolinux/base)	3m 36s
distro-test (opensuse/leap)	7m 14s
distro-test (opensuse/tumbleweed)	3m 39s
distro-test (kalilinux/kali-rolling)	3m 10s
distro-test (voidlinux/voidlinux)	2m 50s
	58m 49s

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