Switch navigation mesh to be based on collision only, not collision and texture meshes

Will need to finetune enemy navigation agent placement depending on if they're now too high/low to sit in the navigation region

Zennysoft.Game.Ma/src/map/dungeon/rooms/Set B/33. Puer's Room.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=29 format=3 uid="uid://b6akxaacr8jd2"]
+[gd_scene load_steps=30 format=3 uid="uid://b6akxaacr8jd2"]
 
 [ext_resource type="Script" uid="uid://bccyfmj8ikewh" path="res://src/map/dungeon/code/SpecialRoom.cs" id="1_r0ujh"]
 [ext_resource type="PackedScene" uid="uid://clg0hy24ip0gd" path="res://src/map/dungeon/models/Area 2/Puer/A2-Puer.glb" id="2_r0ujh"]
@@ -105,6 +105,9 @@ size = Vector3(16.0153, 8.34869, 0.344238)
 height = 4.7168
 radius = 0.452637
 
+[sub_resource type="BoxShape3D" id="BoxShape3D_pycw7"]
+size = Vector3(36.5886, 0.982544, 36.2278)
+
 [sub_resource type="BoxShape3D" id="BoxShape3D_407jo"]
 size = Vector3(36, 6, 36)
 
@@ -285,6 +288,10 @@ shape = SubResource("CylinderShape3D_407jo")
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 17.5273, -3.47329, -9.92922)
 shape = SubResource("CylinderShape3D_407jo")
 
+[node name="CollisionShape3D22" type="CollisionShape3D" parent="Collisions/StaticBody3D2"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -0.174683, -6.34227, -7.33823)
+shape = SubResource("BoxShape3D_pycw7")
+
 [node name="Room" type="Node3D" parent="."]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 2, 0)