contrib/wix/help.wxs

verify: rename "hasmanifest" variable for source code readability

Before this patch, there are two ambiguous variables: "havemf" and
"hasmanifest".

"havemf" means whether there are any "manifest" entries.

"hasmanifest" means whether there are any "changelog" entries
referring to "manifest" entry.

This patch renames from "hasmanifest" to "refersmf" to clear
difference from "havemf".

<?xml version="1.0" encoding="utf-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">

  <?include guids.wxi ?>
  <?include defines.wxi ?>

  <Fragment>
    <DirectoryRef Id="INSTALLDIR">
      <Directory Id="helpdir" Name="help" FileSource="$(var.SourceDir)">
        <Component Id="helpFolder" Guid="$(var.helpFolder.guid)" Win64='$(var.IsX64)'>
          <File Name="config.txt" KeyPath="yes" />
          <File Name="dates.txt" />
          <File Name="diffs.txt" />
          <File Name="environment.txt" />
          <File Name="extensions.txt" />
          <File Name="filesets.txt" />
          <File Name="glossary.txt" />
          <File Name="hgignore.txt" />
          <File Name="hgweb.txt" />
          <File Name="merge-tools.txt" />
          <File Name="multirevs.txt" />
          <File Name="patterns.txt" />
          <File Name="phases.txt" />
          <File Name="revisions.txt" />
          <File Name="revsets.txt" />
          <File Name="subrepos.txt" />
          <File Name="templates.txt" />
          <File Name="urls.txt" />
        </Component>
      </Directory>
    </DirectoryRef>
  </Fragment>

</Wix>