Drop "worker" alias from the web-worker generator

[mgechev]

🐞 Bug report

Command (mark with an x)

- [ ] new
- [ ] build
- [ ] serve
- [ ] test
- [ ] e2e
- [x] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Is this a regression?

Yes, the previous version in which this bug was not present was: ....

No

Description

A clear and concise description of the problem...

As @filipesilva pointed worker could be ambiguous (service worker vs web worker).

🔬 Minimal Reproduction

🔥 Exception or Error

🌍 Your Environment

Anything else relevant?

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