Add TextFile to editor property capitalizations

This is used in the TextFile Extensions editor setting.

editor/editor_property_name_processor.cpp

@@ -263,6 +263,7 @@ EditorPropertyNameProcessor::EditorPropertyNameProcessor() {
 	capitalize_string_remaps["svg"] = "SVG";
 	capitalize_string_remaps["taa"] = "TAA";
 	capitalize_string_remaps["tcp"] = "TCP";
+	capitalize_string_remaps["textfile"] = "TextFile";
 	capitalize_string_remaps["tls"] = "TLS";
 	capitalize_string_remaps["ui"] = "UI";
 	capitalize_string_remaps["uri"] = "URI";