machines/sirius: fixed config

machines/sirius/disko.nix

@@ -51,7 +51,7 @@ in
                   "-0"
                   "extra_attr,inode_checksum,sb_checksum,compression"
                 ];
-                mountOptions = "compress_algorithm=zstd:6,compress_chksum,atgc,gc_merge,lazytime,nodiscard";
+                mountOptions = [ "compress_algorithm=zstd:6,compress_chksum,atgc,gc_merge,lazytime,nodiscard" ];
               };
             };
           };