serve: respect settings from .hg/hgrc create_server was looking only at the root ui object, ignoring any settings from .hg/hgrc. To keep respecting command-line arguments, commands.serve must also call repo.ui.setconfig.

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    <title>#repo|escape#: tags </title>
    <description>#repo|escape# tag history</description>
    #entriesnotip%tagentry#
  </channel>
</rss>