feat(ui-theme): default the theme fallback to bundled dupre

The fallback kicks in when persist/emacs-theme is missing — a fresh machine, or one that's never saved a theme. It was modus-vivendi, which ships with Emacs but has none of the dimming colors this config chooses, so an unconfigured machine looked and dimmed differently from a configured one. I hit exactly that on a second box this week.

dupre is bundled in themes/ and carries those colors, and it loads wherever this config does, so it's the better default. I added a regression test asserting the default is dupre; its loadability is already covered by test-dupre-theme.el. The docstring no longer claims the fallback must be a built-in theme, since dupre isn't one.

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