Fix incorrect z_hop speed for alfawise

Fixes #12641

resources/definitions/alfawise_u30.def.json

@@ -40,6 +40,7 @@
         "machine_max_feedrate_y": { "default_value": 200 },
         "machine_max_feedrate_z": { "default_value": 5 },
         "machine_max_feedrate_e": { "default_value": 100 },
+        "speed_z_hop": { "value": "machine_max_feedrate_z" },
         "machine_max_acceleration_x": { "default_value": 500 },
         "machine_max_acceleration_y": { "default_value": 500 },
         "machine_max_acceleration_z": { "default_value": 10 },