build(plugin-vite): allow renderer name to contain dashes

[broose-goose]

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Summarize your changes:

Small edit to vite plugin to allow VitePluginRendererConfig entries to have hyphens in their name.

Motivation is we have a large forge repo with multiple applications / frontends. We have them organized as follows:

.
└── src/
├── app-1-frontend-1
├── app-2-frontend-1
├── app-2-frontend-2
└── app-3-frontend-1

In forge v7.4.0, vite.base.config.ts was a part of the vite-typescript template. Ran into the issue while trying to update our dependencies as a result of #3583. This shouldn't break any existing users as if they already had "-" in their name, the build would've already been failing

[BlackHole1]

LGTM. but there is a nit

[erickzhao]

LGTM!