Give AISLE flag to internal doors (cataclysmbnteam#1236)

* Give AISLE flag to internal and wood doors

As per suggestion, internal doors should have a stepable aisle flooring integrated to easily maneuver inside a vehicle. This reasoning has been taken to wooden doors, which would require a frame to mount into a car in the first place.

* revert wooden door changes

Removal of the "AISLE" flag from wooden doors, as this would be a change requiring it's own discussion and balance changes.

data/json/vehicleparts/doors.json

@@ -105,7 +105,7 @@
     "damage_reduction": { "all": 28 },
     "description": "An interior door.  Solid construction means you can't see through it when closed.",
     "durability": 240,
-    "flags": [ "OBSTACLE", "OPAQUE", "OPENABLE", "ROOF", "BOARDABLE" ],
+    "flags": [ "OBSTACLE", "OPAQUE", "OPENABLE", "AISLE", "ROOF", "BOARDABLE" ],
     "item": "frame",
     "location": "center",
     "looks_like": "door",