Incorrectly documented default for derefSymlinks

[Bluenix2]

Expected Behavior

According to the documentation for derefSymlinks, the default value is true:

https://github.com/electron/packager/blob/34f88573ed8cc2a1a2f23598906669059babf174/src/types.ts#L356-L362

Actual Behavior

However, as we can see by the call to fs-extra, there is no default value used which means that we rely on their default value:

https://github.com/electron/packager/blob/34f88573ed8cc2a1a2f23598906669059babf174/src/platform.ts#L168-L171

As a result, the actual default value becomes false:

dereference <boolean>: dereference symlinks, default is false.

https://github.com/jprichardson/node-fs-extra/blob/master/docs/copy.md

To Reproduce

Package a repository with symlinks, for example due to usage of workspaces. The final build will also contain symlinks inside of its node_modules/.

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