fix: stop overriding Rails' media default in vite_javascript_tag (#610)

* fix: remove hardcoded media: "screen" default from vite_javascript_tag

vite_javascript_tag was explicitly passing media: "screen" to
stylesheet_link_tag, overriding Rails' own apply_stylesheet_media_default
setting. Users who opt out of the legacy media default (by setting
apply_stylesheet_media_default = false) were still getting media="screen"
on stylesheet link tags generated by vite_javascript_tag.

Changing the default to nil defers to stylesheet_link_tag's own behavior:
when apply_stylesheet_media_default is true (Rails default), it still adds
media="screen"; when it's false, no media attribute is rendered. Callers
who need a specific value can still pass media: "screen" (or any other
value) explicitly.

Fixes #535

* chore: revert change to legacy gem

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Co-authored-by: Ernane <ernane@seguroviagem.srv.br>
Co-authored-by: Maximo Mussini <maximomussini@gmail.com>