Section 49 of the Statute of Limitations, 1957, which extends the periods of limitation fixed by that Act where the person to whom a right of action accrued was under a disability, shall have effect in relation to an action in respect of a claim to the estate of a deceased person or to any share in such estate, whether under a will, on intestacy or as a legal right, as if the period of three years were substituted for the period of six years mentioned in subsection (1) of that section.