Mint-X: Fixing void HTML-tags

- img and input are so called void tags:
  They do not need a closing tag, as they do not have
  (and can not have) any content
Merge branch 'master' of https://github.com/thephpjo/mint-mdm-themes into thephpjo-master

Conflicts:
	usr/share/mdm/html-themes/Mint-X/index.html
Merge branch 'thephpjo-master'