Renaming unknown link room ids to be the same as name

This descrepency was causing a lot of annoyance when using porymap, because porymap generated the ids in map_groups.h from the name, and mapjson was generating map_groups.h from the id in the json files. So just name them the same already like every other map in the repo.

data/maps/UnknownLinkContestRoom_25_29/map.json

@@ -1,5 +1,5 @@
 {
-  "id": "MAP_UNKNOWN_MAP_25_29",
+  "id": "MAP_UNKNOWN_LINK_CONTEST_ROOM_25_29",
   "name": "UnknownLinkContestRoom_25_29",
   "layout": "LAYOUT_UNKNOWN_LINK_CONTEST_ROOM_25_29",
   "music": "MUS_NIBI",

data/maps/UnknownLinkContestRoom_25_30/map.json

@@ -1,5 +1,5 @@
 {
-  "id": "MAP_UNKNOWN_MAP_25_30",
+  "id": "MAP_UNKNOWN_LINK_CONTEST_ROOM_25_30",
   "name": "UnknownLinkContestRoom_25_30",
   "layout": "LAYOUT_UNKNOWN_LINK_CONTEST_ROOM_25_30",
   "music": "MUS_NIBI",

data/maps/UnknownLinkContestRoom_25_31/map.json

@@ -1,5 +1,5 @@
 {
-  "id": "MAP_UNKNOWN_MAP_25_31",
+  "id": "MAP_UNKNOWN_LINK_CONTEST_ROOM_25_31",
   "name": "UnknownLinkContestRoom_25_31",
   "layout": "LAYOUT_UNKNOWN_LINK_CONTEST_ROOM_25_31",
   "music": "MUS_NIBI",

data/maps/UnknownLinkContestRoom_25_32/map.json

@@ -1,5 +1,5 @@
 {
-  "id": "MAP_UNKNOWN_MAP_25_32",
+  "id": "MAP_UNKNOWN_LINK_CONTEST_ROOM_25_32",
   "name": "UnknownLinkContestRoom_25_32",
   "layout": "LAYOUT_UNKNOWN_LINK_CONTEST_ROOM_25_32",
   "music": "MUS_NIBI",

data/maps/UnknownLinkContestRoom_25_33/map.json

@@ -1,5 +1,5 @@
 {
-  "id": "MAP_UNKNOWN_MAP_25_33",
+  "id": "MAP_UNKNOWN_LINK_CONTEST_ROOM_25_33",
   "name": "UnknownLinkContestRoom_25_33",
   "layout": "LAYOUT_UNKNOWN_LINK_CONTEST_ROOM_25_33",
   "music": "MUS_NIBI",

data/maps/UnknownLinkContestRoom_25_34/map.json

@@ -1,5 +1,5 @@
 {
-  "id": "MAP_UNKNOWN_MAP_25_34",
+  "id": "MAP_UNKNOWN_LINK_CONTEST_ROOM_25_34",
   "name": "UnknownLinkContestRoom_25_34",
   "layout": "LAYOUT_UNKNOWN_LINK_CONTEST_ROOM_25_34",
   "music": "MUS_NIBI",