Fix #91271: Reset to Default broken for fluid cache file format

The default wasn't in the list of static enum items which means the
value was reset to 0 instead of the proper default. Even though the
list is dynamically generated, the possible enum items should be
part of the static list anyway.

source/blender/makesrna/intern/rna_fluid.cc

@@ -1315,7 +1315,9 @@ static void rna_def_fluid_domain_settings(BlenderRNA *brna)
 
   /*  Cache type - generated dynamically based on domain type */
   static const EnumPropertyItem cache_file_type_items[] = {
-      {0, "NONE", 0, "", ""},
+      {FLUID_DOMAIN_FILE_UNI, "UNI", 0, "Uni Cache", "Uni file format (.uni)"},
+      {FLUID_DOMAIN_FILE_OPENVDB, "OPENVDB", 0, "OpenVDB", "OpenVDB file format (.vdb)"},
+      {FLUID_DOMAIN_FILE_RAW, "RAW", 0, "Raw Cache", "Raw file format (.raw)"},
       {0, nullptr, 0, nullptr, nullptr},
   };