debian/copyright: Simplify exclusions to work with mk-origtargz

mk-origtargz currently doesn't support brackets in globs.

debian/changelog

@@ -5,6 +5,7 @@ linux (4.18.6-2) UNRELEASED; urgency=medium
   * Move all patch generation scripts to debian/bin
   * [rt] genpatch-rt: Store patches and series file in debian/patches-rt
   * linux-headers: Stop linking the doc directory, which is not binNMU-safe
+  * debian/copyright: Simplify exclusions to work with mk-origtargz
 
   [ Salvatore Bonaccorso ]
   * mac80211: don't update the PM state of a peer upon a multicast frame

debian/copyright

@@ -5,7 +5,7 @@ Files-Excluded: Documentation/netlabel/draft-ietf-cipso-ipsecurity-01.txt
  arch/powerpc/sysdev/micropatch.c
  drivers/media/usb/dvb-usb/af9005-script.h
  drivers/media/i2c/vs6624.c
- drivers/net/appletalk/cops*.[ch]
+ drivers/net/appletalk/cops*
  drivers/video/fbdev/nvidia
  drivers/video/fbdev/riva
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