Neofetch is Bedrock-aware by default, but ignores Bedrock and restricts
itself to the local layer of the Bedrock system when run in Bedrock's
"restricted" mode.  Previously, neofetch checked for restricted mode by
looking at the $PATH, which can fail in some workflows.  Instead, check
for $BEDROCK_RESTRICT, which is more robust.

Neofetch previously counted Bedrock stratum aliases when counting
packages for some package managers.  This resulted in over-counting
packages.  This commit restricts neofetch to only counting actual
strata, not aliases.