align output between when invoked with -be & -ne flags

[sevan]

Summary

Ammend bin/cat/cat.c so the output is the same aside
from blank lines being numbered or unnumbered, depending on whether cat
was invoked with -ne or -be.

At present, when cat is invoked with -be, there is an aditional
difference that the '$' on blank lines is placed on the far left of the
output.

Discussed in bug 210607 but forgot to follow up on it.

[bdrewery]

Also approved to undo this in the same commit: https://svnweb.freebsd.org/base?view=revision&revision=304035
Add into the commit this as well to help with any POLA issues:

Relnotes: yes

[bdrewery]

In D12432#257819, @bdrewery wrote:

Also approved to undo this in the same commit: https://svnweb.freebsd.org/base?view=revision&revision=304035
Add into the commit this as well to help with any POLA issues:

Relnotes: yes

Also be sure to tie to the PR since it notes some of the problems.