Use BIO_indent() for indentation in tasn_prn.c

Using a loop to print pieces of a static buffer containing 20 spaces to
indent things is just silly. Even sillier is making this buffer const
without looking what it's actually used for... There is BIO_indent() or
BIO_printf() that can handle "%*s".

Add a length check to preserve behavior since BIO_indent() succeeds for
negattive indent.

However, peak silliness must be how BIO_dump_indent_cb() indents things.
That's for another day.

ok jsing

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