name-as-module from stack new should be PascalCase

At the moment, command `stack new hello-world $TEMPLATE_NAME` generates project structure where `name-as-module` value is `Helloworld` instead of `HelloWorld`. Example

```bash
stack new hello-world \
  github:tkachuk-labs/nix-concur-replica \
  -p organization:tkachuk-labs \
  -p env-prefix:HELLO_WORLD \
  --resolver lts-14.27
```