Fixed "Back" button on right-size recommendation page

https://bugzilla.redhat.com/show_bug.cgi\?id\=1121802
@romanblanco noticed 2 issues,first back button is placed on the bottom left of screen should be on the bottom right. Second we don't need :continue => true here, just change alt/title/image of button and change value of :button => 'back' leave rest of the button_tag as it is, also in controller change right_size method to check for for params[:button] == "back"