mkosi: Install openSUSE-release instead of distribution-release

distribution-release is a virtual package that is by default satisfied
by the openSUSE MicroOS-release package. Let's make sure we pull in the
generic openSUSE-release package instead by installing
patterns-base-minimal_base which has a Suggests dependency on
openSUSE-release which makes sure it takes priority over the MicroOS one.

mkosi.images/system/mkosi.conf.d/10-opensuse/mkosi.conf

@@ -27,7 +27,6 @@ Packages=
         cryptsetup
         dbus-broker
         device-mapper
-        distribution-release
         docbook-xsl-stylesheets
         f2fs-tools
         gawk
@@ -43,6 +42,7 @@ Packages=
         openssh-clients
         openssh-server
         pam
+        patterns-base-minimal_base
         python3-pefile
         quota
         rpm-build