xpanes: remove unused textures (#2614)

mods/xpanes/init.lua

@@ -137,7 +137,11 @@ function xpanes.register_pane(name, def)
 		is_ground_content = false,
 		sunlight_propagates = true,
 		description = def.description,
-		tiles = {def.textures[3], def.textures[3], def.textures[1]},
+		tiles = {
+			def.textures[3],
+			def.textures[3],
+			def.textures[1]
+		},
 		groups = groups,
 		drop = "xpanes:" .. name .. "_flat",
 		sounds = def.sounds,
@@ -161,7 +165,7 @@ end
 
 xpanes.register_pane("pane", {
 	description = S("Glass Pane"),
-	textures = {"default_glass.png","xpanes_pane_half.png","xpanes_edge.png"},
+	textures = {"default_glass.png", "", "xpanes_edge.png"},
 	inventory_image = "default_glass.png",
 	wield_image = "default_glass.png",
 	sounds = default.node_sound_glass_defaults(),
@@ -174,7 +178,7 @@ xpanes.register_pane("pane", {
 
 xpanes.register_pane("obsidian_pane", {
 	description = S("Obsidian Glass Pane"),
-	textures = {"default_obsidian_glass.png","xpanes_pane_half.png","xpanes_edge_obsidian.png"},
+	textures = {"default_obsidian_glass.png", "", "xpanes_edge_obsidian.png"},
 	inventory_image = "default_obsidian_glass.png",
 	wield_image = "default_obsidian_glass.png",
 	sounds = default.node_sound_glass_defaults(),
@@ -187,7 +191,7 @@ xpanes.register_pane("obsidian_pane", {
 
 xpanes.register_pane("bar", {
 	description = S("Steel Bars"),
-	textures = {"xpanes_bar.png","xpanes_bar.png","xpanes_bar_top.png"},
+	textures = {"xpanes_bar.png", "", "xpanes_bar_top.png"},
 	inventory_image = "xpanes_bar.png",
 	wield_image = "xpanes_bar.png",
 	groups = {cracky=2},