fix some warnings in design theme (remove screenshot src)
fix some warnings in design theme (remove screenshot src)

git-svn-id: d62cbc78cd6aef3f607da0e2419a3cf172e31fd6@71 a35146cb-b0d3-3b4e-005d-c28991089fd7

xpressengine/xe-module-forum,xpressengine/xe-module-forum