fixup: rm collides property in layers, fix 2nd floor description

dungeon_1st_floor.json

@@ -1,4 +1,11 @@
 { "compressionlevel":-1,
+ "editorsettings":
+    {
+     "export":
+        {
+         "target":"."
+        }
+    },
  "height":81,
  "infinite":false,
  "layers":[
@@ -8,12 +15,6 @@
          "id":7,
          "name":"collides",
          "opacity":1,
-         "properties":[
-                {
-                 "name":"collides",
-                 "type":"bool",
-                 "value":true
-                }],
          "type":"tilelayer",
          "visible":true,
          "width":81,

dungeon_2nd_floor.json

@@ -15,12 +15,6 @@
          "id":7,
          "name":"collides",
          "opacity":1,
-         "properties":[
-                {
-                 "name":"collides",
-                 "type":"bool",
-                 "value":true
-                }],
          "type":"tilelayer",
          "visible":true,
          "width":81,
@@ -278,7 +272,7 @@
         {
          "name":"mapDescription",
          "type":"string",
-         "value":"Dungeon first floor"
+         "value":"Dungeon second floor"
         }, 
         {
          "name":"mapLink",
@@ -288,7 +282,7 @@
         {
          "name":"mapName",
          "type":"string",
-         "value":"Dungeon_1st_floor"
+         "value":"Dungeon_2nd_floor"
         }],
  "renderorder":"right-down",
  "tiledversion":"1.4.3",

dungeon_entrance.json

@@ -15,12 +15,6 @@
          "id":4,
          "name":"collides",
          "opacity":1,
-         "properties":[
-                {
-                 "name":"collides",
-                 "type":"bool",
-                 "value":true
-                }],
          "type":"tilelayer",
          "visible":true,
          "width":30,