app-shells/bash: bashrc: avoid always exporting default LS_COLORS

We've long been exporting the LS_COLORS variable to the default env,
but in practice, there's no reason to be doing this in the majority
of cases.  The value we most often load is equivalent to the default
which means we're polluting the env and adding overhead for no gain.
Add a little more code (and one extra `dircolors` exec unfortunately)
to check to see if the LS_COLORS value we found is the default.  If
so, don't bother exporting it anymore.

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