fix(comiler): correct realPath to realpath

[mprobst]

The optional property on ts.CompilerHost is called realpath (lower case), not realPath (lower camel case).

It is not clear to me what the impact of this is, but the author's intent was clearly to override realpath.

This was not caught by the compiler as realpath is optional, so these were just different properties.

[mary-poppins]

You can preview 07a92f6 at https://pr25023-07a92f6.ngbuilds.io/.

[ngbot]

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[mary-poppins]

You can preview 8eacba0 at https://pr25023-8eacba0.ngbuilds.io/.

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