[openstreetmap/openstreetmap-website] make cpanp command help working without requiring changes from user (#1763)

[Mateusz Konieczny]

> I'm not sure we should

At least for me (I attempting to fix #1762) this instruction was really helpful.

> os packages vs cpan vs cpanp

in this case cpanp is already selected, but provided command is invalid. AFAIK this PR is not changing anything as this competition goes.

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