OutputPage: Move our <meta charset="...> so it's placed above the title

It's recommended for the meta charset to be placed before the <title> since
<title> contains text which is inside the character set defined by the meta charset.

Use of meta charset inside XHTML also seems to be redundant, not recommended,
and is very likely completely ignored.

Change-Id: I335b0598a9615540dc5e917682508b4a8d32d96e