bash_completion: Fix mistake introduced in merge 6a74f584

This part of the code was duplicated by accident.

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

autotools/build-bash-completion

@@ -767,11 +767,6 @@ def main():
   sw.Write("gnt_shopt_extglob=$(shopt -p extglob || :)")
   sw.Write("shopt -s extglob")
 
-  # Remember original state of extglob and enable it (required for pattern
-  # matching; must be enabled while parsing script)
-  sw.Write("gnt_shopt_extglob=$(shopt -p extglob || :)")
-  sw.Write("shopt -s extglob")
-
   WritePreamble(sw, not options.compact)
 
   # gnt-* scripts