Nano: Braindead me overlooked the rootfiles were misplaced

This was introduced in b1c25d7a8456b7ff05f23c461c623dc18fddbae4, and
subsequently broke the nightly builds, and I failed to spot this in the
first place. :-/

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>

diff --git a/config/rootfiles/core/nano b/config/rootfiles/common/nano
similarity index 100%
rename from config/rootfiles/core/nano
rename to config/rootfiles/common/nano