MDEV-9969 mysql_install_db error processing ignore_db_dirs.

        Changes to the mysql_install_db scripts so they don't repeat
        arguments twice.

scripts/mysql_install_db.pl.in

@@ -238,7 +238,7 @@ sub quote_options {
 ##############################################################################
 
 my $opt = {};
-parse_arguments($opt, 'PICK-ARGS-FROM-ARGV', @ARGV);
+parse_arguments($opt, @ARGV);
 
 # ----------------------------------------------------------------------
 # We can now find my_print_defaults.  This script supports:

scripts/mysql_install_db.sh

@@ -216,7 +216,7 @@ cannot_find_file()
 # Ok, let's go.  We first need to parse arguments which are required by
 # my_print_defaults so that we can execute it first, then later re-parse
 # the command line to add any extra bits that we need.
-parse_arguments PICK-ARGS-FROM-ARGV "$@"
+parse_arguments "$@"
 
 #
 # We can now find my_print_defaults.  This script supports: