Fix misssing indend in html void tag generation

src/SSG/HTML.idr

@@ -63,8 +63,8 @@ namespace Html
     if length attributes > 0
       then
         let attrs = joinBy " " $ map toString attributes
-        in "<\{type} \{attrs} />"
-      else "<\{type} />"
+        in "\{indent}<\{type} \{attrs} />"
+      else "\{indent}<\{type} />"
   viewIndented indent_level (Normal type attributes {content_types} contents) =
     let indent = replicate (indent_level * 2) ' ' in
     -- Special handling if the tag contains exactly one `Text` element, we won't