virt-install: Fix typo in previous commit
I had this locally but must have forgotten to amend.
@@ -159,7 +159,7 @@ if args.delete_ostree_ref:
print("virt-install: Will remove ostree ref")
ks_tmp.write(f"""
%post --erroronfail
-ostree refs --delete ${args.ostree_remote}:${args.ostree_ref}
+ostree refs --delete {args.ostree_remote}:{args.ostree_ref}
%end
""")
