fix(util-defaults-mode-browser): import bowser by default export

[AllanZhengYP]

Issue

Resolves #3202

Description

Similar to #1991, fix Vite build by importing bowser from default export

Testing

./node_modules/.bin/snowpack build
[24:35:27] [snowpack] Hint: run "snowpack init" to create a project config file. Using defaults...
[24:35:27] [snowpack] ! building files...
[24:35:27] [snowpack] ✔ files built. [0.05s]
[24:35:27] [snowpack] ! building dependencies...
[24:35:31] [snowpack] ✔ dependencies built. [3.26s]
[24:35:31] [snowpack] ! writing to disk...
[24:35:31] [snowpack] ✔ write complete. [0.02s]
[24:35:31] [snowpack] ▶ Build Complete!

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[Thomasorus]

Thanks for your PR, encountered this bug today. I hope it will be merged soon.

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