completion: complete --{reuse,reedit}-message= for all notes subcmds

The new subcommand that takes these options is 'git notes edit'. Just
accept the options from subcommands since we handle them the same way
in builtin/notes.c anyway. If a user does

    git prune --reuse-message=...

just let the command catches that error when it's executed.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/completion/git-completion.bash

@@ -1832,8 +1832,7 @@ _git_notes ()
 			;;
 		esac
 		;;
-	add,--reuse-message=*|append,--reuse-message=*|\
-	add,--reedit-message=*|append,--reedit-message=*)
+	*,--reuse-message=*|*,--reedit-message=*)
 		__git_complete_refs --cur="${cur#*=}"
 		;;
 	*,--*)