Set proper value for raft monotonic surface

CURA-11438

resources/definitions/fdmprinter.def.json

@@ -6459,6 +6459,7 @@
                     "description": "Print raft top surface lines in an ordering that causes them to always overlap with adjacent lines in a single direction. This takes slightly more time to print, but makes the surface look more consistent, which is also visible on the model bottom surface.",
                     "type": "bool",
                     "default_value": false,
+                    "value": "skin_monotonic",
                     "enabled": "resolveOrValue('adhesion_type') == 'raft' and raft_surface_layers > 0",
                     "settable_per_mesh": false,
                     "settable_per_extruder": true,