Remove an explicit cache call in _content.html.erb
Remove an explicit cache call in _content.html.erb

This call is excessive, as the content is cached via `render_posts`.

thredded/thredded,jayroh/thredded,thredded/thredded,thredded/thredded,jayroh/thredded,jayroh/thredded,jayroh/thredded,thredded/thredded