Room schema: Remove defaults for string enums

The current default is an empty string, which is not actually a valid
value of the types.

Author: ampleyfly

schema/m3-room.schema.json

@@ -1755,15 +1755,13 @@
             "type": "string",
             "title": "Node Type",
             "description": "Examples: door, item, junction",
-            "default": "",
             "examples": ["door", "entrance", "exit", "item"],
             "enum": ["door", "entrance", "exit", "item", "junction", "utility"],
             "pattern": "^(.*)$"
           },
           "nodeSubType": {
             "type": "string",
             "title": "Node SubType",
-            "default": "",
             "examples": ["chozo", "hidden", "visible"],
             "enum": [
               "chozo",
@@ -1895,7 +1893,6 @@
                 "lockType": {
                   "type": "string",
                   "title": "Lock Type",
-                  "default": "",
                   "enum": [
                     "bossFight",
                     "coloredDoor",
@@ -2047,7 +2044,6 @@
             "type": "string",
             "title": "Obstacle Type",
             "description": "The main type of obstacle. Examples include 'inanimate', 'enemies', and 'abstract'",
-            "default": "",
             "examples": ["inanimate", "enemies", "abstract"],
             "enum": ["inanimate", "enemies", "abstract"],
             "pattern": "^(.*)$"