Removed explicit webpack entries in dev

[jameshartig]

What kind of change does this PR introduce?

Bigfix to remove duplicate requires for webpack-dev-server/client which end up causing unnecessary traffic and errors.

Did you add tests for your changes?

No tests were added

Summary

Fixes #1387

Does this PR introduce a breaking change?

No

Other information

According to webpack/webpack-dev-server#711 we don't need to explicitly include these entries as they are added automatically.

[jameshartig]

Looks like tests failed because of:

preact-cli:   ● preact create › should have 'apple-touch-icon' meta tag
preact-cli:     expect(received).toEqual(expected) // deep equality
preact-cli:     Expected: true
preact-cli:     Received: false

but I see other PRs with the same failure. Is that just a flaky test?

[rschristian]

Looks like this change was implemented in #1395, you're probably good to close this.

[jameshartig]

@ryanchristian4427 yep, looks like it.