test: fix svg check for vite 5

[bluwy]

There's a test at

unocss/test/fixtures.test.ts

Lines 66 to 67 in d0e101d

	const svgs = await fg('dist/assets/uno-*.svg', { cwd: root, absolute: true })
	expect(svgs).toHaveLength(1)

that expects an SVG asset to be emitted. However in Vite 5, SVG assets are also inline-able so this would be inside the CSS file instead.

I updated the Vite config to fix this for now.

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