scm: add rev param to "View revisions" (#7984).

There are two paths to show specific revision.
* http://www.redmine.org/projects/redmine/repository/revisions/5219/show
* http://www.redmine.org/projects/redmine/repository/show?rev=5219

First link is http://www.redmine.org/projects/redmine/repository/revisions/5219/changes .
But, Second link is http://www.redmine.org/projects/redmine/repository/changes .

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@5222 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/repositories/show.rhtml

@@ -31,7 +31,10 @@
 |
 <%= link_to l(:label_view_revisions),
                    :action => 'changes',
-                   :path => to_path_param(@path), :id => @project %>
+                   :path   => to_path_param(@path),
+                   :id     => @project,
+                   :rev    => @rev
+                   %>
 <%   end %>
 </p>