Set minimum layer time to 10 seconds

Via inheritance this is applied to all Creality printers.

resources/definitions/creality_cr10.def.json

@@ -50,7 +50,7 @@
             "default_value": 40
         },
         "cool_min_layer_time": {
-            "default_value": 15
+            "default_value": 10
         },
         "adhesion_type": {
             "default_value": "skirt"