Fixed deprecated render calls in Mailer.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@9640 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/mailer/issue_edit.text.erb

@@ -9,4 +9,4 @@
 
 <% end -%>
 ----------------------------------------
-<%= render :partial => "issue.text.erb", :locals => { :issue => @issue, :issue_url => @issue_url } %>
+<%= render :partial => 'issue', :formats => [:text], :locals => { :issue => @issue, :issue_url => @issue_url } %>