Gui 1089 Allow image description and launch permissions to be updated

I have checked the other pages, which were the launch instance and launch instance like this. It'd be better to have the panel not have the <hr> printed directly since in case of the images not having the block device map, the page is shown without <hr> line. For instance, the tag editor panel does not print <hr> at its top rather other pages as <hr> before adding the panel.