hgweb: don't show summary link as active on error pages in monoblue

These two error pages in monoblue think they are the summary page, when they
clearly aren't.

mercurial/templates/monoblue/error.tmpl

@@ -18,7 +18,7 b''
         </form>
 
         <ul class="page-nav">
-            <li class="current">summary</li>
+            <li><a href="{url|urlescape}summary{sessionvars%urlparameter}">summary</a></li>
             <li><a href="{url|urlescape}shortlog{sessionvars%urlparameter}">shortlog</a></li>
             <li><a href="{url|urlescape}log{sessionvars%urlparameter}">changelog</a></li>
             <li><a href="{url|urlescape}graph{sessionvars%urlparameter}">graph</a></li>

mercurial/templates/monoblue/notfound.tmpl

@@ -18,7 +18,7 b''
         </form>
 
         <ul class="page-nav">
-            <li class="current">summary</li>
+            <li><a href="{url|urlescape}summary{sessionvars%urlparameter}">summary</a></li>
             <li><a href="{url|urlescape}shortlog{sessionvars%urlparameter}">shortlog</a></li>
             <li><a href="{url|urlescape}log{sessionvars%urlparameter}">changelog</a></li>
             <li><a href="{url|urlescape}graph{sessionvars%urlparameter}">graph</a></li>