Fix sorting in RootOf.real_roots() #1117
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Porting of PRS algorithm was done by diofant#994. Closes sympy/sympy#20874
In the triggered by solve_poly_inequality() example, the problem polynomial is something like (x + 1)**3*(3*x + 1). In this case, for distinct roots, we have isolating intervals like r1=[-1, -1] (this root is from the ground domain, ZZ) and r2=[-1, 0] (for x=-1/3). Second root is not going to be improved by sorting helper, since r1.b==r2.a. Closes sympy/sympy#20902
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