inconistency in default value of $index param for media::stylesheet()

[JAAulde]

Media Module - Media helper

with the closure of #526 media::script(), html::script(), html::stylesheet(), and html::link() all set the default value of their $index param to FALSE. but media::stylesheet() still has the $index param set to TRUE.

to keep all of these interfaces consistent, media::stylesheet should also default this param to FALSE

while this is a simple change, it changes the exposed interface so this can't happen until 2.2 this ticket is to remind me to do it

[Shadowhand]

Actually media::script() should have it's $index param set to TRUE to be consistent.

Fixed in r2987.