Swap the frowning and disappointed emoji.

If :) is a smile then :( is a frown. Language matters.
Merge branch 'master' of github.com:vanilla/vanilla into hotfix/emoji-swap

Conflicts:
	resources/emoji/frowning.png
	resources/emoji/worried.png
Merge pull request #2094 from vanilla/hotfix/emoji-swap

Swap the frowning and disappointed emoji.