Checks if an equilibrium eq with negotiation payoffs is an RNE

We simply solve the truncated game with r1 and r2 and check whether the resultig r1 and r2 are the same

rel_is_eq_rne(
  g,
  eq = g[["eq"]],
  r1 = eq$r1,
  r2 = eq$r2,
  r.tol = 1e-10,
  verbose = TRUE
)