mkosi: add libz1 to packages list on opensuse

/usr/lib/systemd/systemd: error while loading shared libraries: libz.so.1: cannot open shared object file: No such file or directory

(cherry picked from commit 6fdd047)

Author: bluca

mkosi.presets/00-base/mkosi.conf.d/10-opensuse.conf

@@ -30,6 +30,7 @@ Packages=
         libqrencode4
         libseccomp2
         libxkbcommon0
+        libz1
         libzstd1
         pam
         shadow