fix(browser): apply inlined workspace config to browser mode vite server

[hi-ogawa]

Description

Closes #4744

For non browser project, inlined workspace project config is included into vite server config via spreading during initializeProject:

vitest/packages/vitest/src/node/workspace.ts

Lines 42 to 53 in c9824cb

	const config: ViteInlineConfig = {
	...options,
	root,
	logLevel: 'error',
	configFile,
	// this will make "mode": "test" | "benchmark" inside defineConfig
	mode: options.test?.mode || options.mode || ctx.config.mode,
	plugins: [
	...options.plugins || [],
	WorkspaceVitestPlugin(project, { ...options, root, workspacePath }),
	],
	}

However, browser mode's additional vite server instantiation was missing such logic, which leads to an issue when users relies on root workspace config without dedicated vite/vitest config file for the browser test project.

In this PR, I copied over only test: ..., but maybe it should spread everything like initializeProject does above since otherwise it would still miss inlined base vite config. (EDIT: I did so in aff160d)

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