mac80211: update regdb.txt

This was copied from wireless-regdb.git commit a14052b85e5d70e37a31962a9c56c0cdbb9acafc

The passive-scan/no-ibss flag of channels 36-48 in the world regd were
removed like it was done in r32126.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 38797