Updating favicon to pass validation

Steps to reproduce:

• Use W3C Validator and specify one of our instances like: qa.jtalks.org/jcommune

AR: The string shortcut is not a registered keyword
ER: validator doesn't complain about favicon

Explanation

According to this resource icons that are marked as <link rel="icon"> are considered as favicons by browsers (the icons that are shown on the browser tab bar near the site name). Historically we could add a word 'shortcut icon' like this:

<link rel="shortcut icon" type="image/x-icon" href="/jcommune/admin/icon/ico"/>

The explanation goes like this:

For historical reasons, the icon keyword may be preceded by the keyword "shortcut". If the "shortcut" keyword is present, it must be come immediately before the icon keyword and the two keywords must be separated by only a single U+0020 SPACE character.

But now W3C Validator started to complain about it:

Error: Bad value shortcut icon for attribute rel on element link: The string shortcut is not a registered keyword. The string shortcut is not an absolute URL.

So we need to get rid of this word, browsers will recognize favicons by 'icon' word. Note, that according to the resource above it's possible to have several favicons and browsers may decide on their own which of them they'd like to use.