Update reference cases for fixed check

The combination of
* group
* pot-shift
* rcoulomb > rlist
* rlistlong == -1
(as used in these four tests) was erroneously treated in
readir.c. Fixing that issues a new warning, for which we need to
update these tests.

Change-Id: I276b7e5632b085e570fec52cd1b96d0bf8ba42b8