make vimwiki#html#Wiki2HTML respect 'html_filename_parameterization'

Fixes `:Vimwiki2HTMLBrowse` when vimwiki_markdown is in use.

autoload/vimwiki/html.vim

@@ -1870,8 +1870,12 @@ function! s:convert_file(path_html, wikifile) abort
     let force = 1
     call vimwiki#html#CustomWiki2HTML(root_path_html, path_html, wikifile, force)
     let done = 1
+    if vimwiki#vars#get_wikilocal('html_filename_parameterization')
+      return path_html . s:parameterized_wikiname(htmlfile)
+    else
       return path_html.htmlfile
     endif
+  endif
 
   if s:syntax_supported() && done == 0
     let html_lines = s:convert_file_to_lines_template(wikifile, path_html . htmlfile)