allow nested dictionaries in dict_to_lua

data/factorio/mod_template/macros.lua

@@ -1,7 +1,7 @@
 {% macro dict_to_lua(dict) -%}
 {
 {%- for key, value in dict.items() -%}
-    ["{{ key }}"] = {{ value | safe }}{% if not loop.last %},{% endif %}
+    ["{{ key }}"] = {% if value is mapping %}{{ dict_to_lua(value) }}{% else %}{{ value | safe }}{% endif %}{% if not loop.last %},{% endif %}
 {% endfor -%}
 }
 {%- endmacro %}