[FIX] portal: raise front-end asset priority
[FIX] portal: raise front-end asset priority

This is necessary to make it among the first of the "assets frontend"
inherited views, and specifically make it appear *before* the one from
website. Without this, SCSS styles may be randomly broken if the
original installation order of `portal` and `website` was reversed
(e.g. for older databases).

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