conforms file names to consistant standard

scenes/seller/scr_seller.gd

@@ -0,0 +1,7 @@
+class_name Shredder extends StaticBody3D
+
+
+func _on_interact_button_button_interacted(_value: int, callback: Hero) -> void:
+	var cassette: Cassette = callback.inventory.remove_at(callback.inventory_selected_index) as Cassette
+	callback.currency += 5 * (cassette.rarity + 1)
+	callback.decrement_selected()