wrong collectl syntax for rawdskfilt in monitoring.py

wrong syntax in monitoring.py causing collectl to not run:

> collectl -s+mYZ -i 1:10 --rawdskfilt "+cciss/c\d+d\d+ |hd[ab] | sd[a-z]+ |dm-\d+ |xvd[a-z] |fio[a-z]+ | vd[a-z]+ |emcpower[a-z]+ |psv\d+ |nvme[0-9]n[0-9]+p[0-9]+ " -F0 -f /tmp/cbt/00000000/LibrbdFio/osd_ra-00001024/op_size-00004094/concurrent_procs-004/iodepth-064/read/pool_monitoring/collectl
Quantifier follows nothing in regex; marked by <-- HERE in m/+ <-- HERE cciss/c\d+d\d+ |hd[ab] | sd[a-z]+ |dm-\d+ |xvd[a-z] |fio[a-z]+ | vd[a-z]+ |emcpower[a-z]+ |psv\d+ |nvme[0-9]n[0-9]+p[0-9]+ / at /usr/share/collectl/formatit.ph line 235.

so instead
`rawdskfilt = '+cciss/c\d+d\d+ |hd[ab] | sd[a-z]+ |dm-\d+ |xvd[a-z] |fio[a-z]+ | vd[a-z]+ |emcpower[a-z]+ |psv\d+ |nvme[0-9]n[0-9]+p[0-9]+ '`

it should be
`rawdskfilt = 'cciss/c\d+d\d+ |hd[ab] | sd[a-z]+ |dm-\d+ |xvd[a-z] |fio[a-z]+ | vd[a-z]+ |emcpower[a-z]+ |psv\d+ |nvme[0-9]n[0-9]+p[0-9]+ '`