/usr/share/mercurial/templates/paper/diffstat.tmpl is in mercurial-common 4.5.3-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<td class="diffstat-file"><a href="#l{fileno}.1">{file|escape}</a></td>
<td class="diffstat-total" align="right">{total}</td>
<td class="diffstat-graph">
<span class="diffstat-add" style="width:{addpct}%;"> </span>
<span class="diffstat-remove" style="width:{removepct}%;"> </span>
</td>
</tr>
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