修复z-index造成dialog显示的问题

src/levels/Level1.tscn

@@ -92,30 +92,37 @@ position = Vector2( 112, 144 )
 [node name="Monster2" parent="Items" instance=ExtResource( 6 )]
 position = Vector2( 144, 144 )
 animation = "redSlime"
+frame = 0
 
 [node name="Monster4" parent="Items" instance=ExtResource( 6 )]
 position = Vector2( 336, 432 )
 animation = "bat"
+frame = 0
 
 [node name="Monster9" parent="Items" instance=ExtResource( 6 )]
 position = Vector2( 240, 304 )
 animation = "bat"
+frame = 0
 
 [node name="Monster10" parent="Items" instance=ExtResource( 6 )]
 position = Vector2( 272, 304 )
 animation = "bluePriest"
+frame = 0
 
 [node name="Monster11" parent="Items" instance=ExtResource( 6 )]
 position = Vector2( 304, 304 )
 animation = "bat"
+frame = 0
 
 [node name="Monster7" parent="Items" instance=ExtResource( 6 )]
 position = Vector2( 80, 240 )
 animation = "skeleton"
+frame = 0
 
 [node name="Monster8" parent="Items" instance=ExtResource( 6 )]
 position = Vector2( 80, 336 )
 animation = "skeletonSoilder"
+frame = 0
 
 [node name="Monster5" parent="Items" instance=ExtResource( 6 )]
 position = Vector2( 304, 464 )

src/navigation/NavigationTileset.tres

@@ -17,7 +17,7 @@
 1/shape_one_way = false
 1/shape_one_way_margin = 0.0
 1/shapes = [  ]
-1/z_index = 1
+1/z_index = -1
 2/name = "terrains.png 2"
 2/texture = ExtResource( 1 )
 2/tex_offset = Vector2( 0, 0 )