Fix XHTML validation error on file diff page.

Replaces <div>, a block level element, with <span>, it's inline
counterpart, in <pre>, which is also an inline element.

templates/gitweb/map

@@ -24,10 +24,10 b' filediff = filediff.tmpl'
 filelog = filelog.tmpl
 fileline = '<div style="font-family:monospace" class="parity#parity#"><pre><span class="linenr">   #linenumber#</span> #line|escape#</pre></div>'
 annotateline = '<tr style="font-family:monospace" class="parity#parity#"><td class="linenr" style="text-align: right;"><a href="#url#annotate/#node|short#/#file|urlescape#{sessionvars%urlparameter}">#author|obfuscate#@#rev#</a></td><td><pre>#line|escape#</pre></td></tr>'
-difflineplus = '<div style="color:#008800;">#line|escape#</div>'
-difflineminus = '<div style="color:#cc0000;">#line|escape#</div>'
-difflineat = '<div style="color:#990099;">#line|escape#</div>'
-diffline = '<div>#line|escape#</div>'
+difflineplus = '<span style="color:#008800;">#line|escape#</span>'
+difflineminus = '<span style="color:#cc0000;">#line|escape#</span>'
+difflineat = '<span style="color:#990099;">#line|escape#</span>'
+diffline = '<span>#line|escape#</span>'
 changelogparent = '<tr><th class="parent">parent #rev#:</th><td class="parent"><a href="#url#rev/#node|short#{sessionvars%urlparameter}">#node|short#</a></td></tr>'
 changesetparent = '<tr><td>parent {rev}</td><td style="font-family:monospace"><a class="list" href="{url}rev/{node|short}{sessionvars%urlparameter}">{node|short}</a></td></tr>'
 filerevparent = '<tr><td>parent {rev}</td><td style="font-family:monospace"><a class="list" href="{url}file/{node|short}/{file|urlescape}{sessionvars%urlparameter}">{rename%filerename}{node|short}</a></td></tr>'