simplify and fix wg.conf output() macros

wireguard/files/wg.conf

@@ -1,17 +1,12 @@
 {%- macro output(key, value) -%}
-	{%- if key in ['Address', 'DNS', 'AllowedIPs'] -%}
-{{output_list(key, value)}}
-	{%- else -%}
-{{key}} = {{value}}
-	{%- endif -%}
-{%- endmacro -%}
-{%- macro output_list(key, value) -%}
 	{%- if value is string -%}
 {{key}} = {{value}}
-	{%- else -%}
+	{%- elif value is iterable -%}
 		{%- for item in value %}
 {{key}} = {{item}}
 		{%- endfor -%}
+	{%- else -%}
+{{key}} = {{value}}
 	{%- endif -%}
 {%- endmacro -%}
 [Interface]