Bug in nth_root() for finite rings (related to p_adic printing)

[Bohua]

An example that triggers the bug is:

roots = mod(-1, 4489).nth_root(2, all=True)

Note 4489=67^2 and 67^2 is the first prime >62.

Following the hint given in the printed error, I changed the print mode near line 1168 of rings/finite_rings/integer_mod.pyx from 'digits' to 'bars'. This fixes the problem, but I don't know whether it will mess up something else.

Version 5.0.1 on Linux

[David Roe]

Thanks for catching that.  #13172 is ready for review.
David
http://trac.sagemath.org/sage_trac/ticket/13172

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