new raft base thickness default

The new default of the raft base thickness is close to the current values. The limited thickness of 0.3mm is used to avoid extreme flowrate for 06 and 08 nozzle sizes. PP-243

resources/definitions/ultimaker.def.json

@@ -239,6 +239,9 @@
         "gradual_support_infill_step_height": {
             "value": "4*layer_height"
         },
+        "raft_base_thickness": {
+            "value": "min(machine_nozzle_size * 0.75, 0.3)"
+        },
         "raft_interface_line_width": {
             "value": "(raft_base_line_width + raft_surface_line_width) / 2"
         },

resources/definitions/ultimaker3.def.json

@@ -112,7 +112,6 @@
         "optimize_wall_printing_order": { "value": "True" },
         "prime_tower_enable": { "default_value": true },
         "raft_airgap": { "value": "0" },
-        "raft_base_thickness": { "value": "0.3" },
         "retraction_amount": { "value": "6.5" },
         "retraction_hop": { "value": "2" },
         "retraction_hop_enabled": { "value": "extruders_enabled_count > 1"  },

resources/definitions/ultimaker_s3.def.json

@@ -102,7 +102,6 @@
         "prime_tower_enable": { "value": "True" },
         "raft_airgap": { "value": "0" },
         "raft_base_speed": { "value": "20" },
-        "raft_base_thickness": { "value": "0.3" },
         "raft_interface_speed": { "value": "20" },
         "raft_speed": { "value": "25" },
         "retraction_amount": { "value": "6.5" },

resources/definitions/ultimaker_s5.def.json

@@ -103,7 +103,6 @@
         "prime_tower_enable": { "value": "True" },
         "raft_airgap": { "value": "0" },
         "raft_base_speed": { "value": "20" },
-        "raft_base_thickness": { "value": "0.3" },
         "raft_interface_speed": { "value": "20" },
         "raft_speed": { "value": "25" },
         "retraction_amount": { "value": "6.5" },