hgweb: resurrect <span> tag on diffline to fix rendering in monoblue style
It was removed at 606a3bf82e30 as a useless tag, but it is necessary to
apply "div.diff pre span" style.
http://selenic.com/repo/hg/rev/606a3bf82e30?style=monoblue
--- a/mercurial/templates/monoblue/map Wed Apr 01 13:27:56 2015 -0500
+++ b/mercurial/templates/monoblue/map Thu Apr 02 21:29:05 2015 +0900
@@ -103,7 +103,7 @@
difflineplus = '<span class="difflineplus"><a class="linenr" href="#{lineid}" id="{lineid}">{linenumber}</a> {line|escape}</span>'
difflineminus = '<span class="difflineminus"><a class="linenr" href="#{lineid}" id="{lineid}">{linenumber}</a> {line|escape}</span>'
difflineat = '<span class="difflineat"><a class="linenr" href="#{lineid}" id="{lineid}">{linenumber}</a> {line|escape}</span>'
-diffline = '<a class="linenr" href="#{lineid}" id="{lineid}">{linenumber}</a> {line|escape}'
+diffline = '<span><a class="linenr" href="#{lineid}" id="{lineid}">{linenumber}</a> {line|escape}</span>'
comparisonblock ='
<tbody class="block">