Revert "Added --titlebar option to enable/disable the titlebar"

This reverts commit c675886d.

The bug was introduced in e3f5789a and fixed in 1af74d52

The option was introduced between those two commits and now it's
redundant again.

mysql-test/mysql-test-run.pl

@@ -365,7 +365,7 @@ my $opt_max_save_core= env_or_val(MTR_MAX_SAVE_CORE => 5);
 my $opt_max_save_datadir= env_or_val(MTR_MAX_SAVE_DATADIR => 20);
 my $opt_max_test_fail= env_or_val(MTR_MAX_TEST_FAIL => 10);
 my $opt_core_on_failure= 0;
-my $opt_titlebar= 0;
+
 my $opt_parallel= $ENV{MTR_PARALLEL} || 1;
 my $opt_port_group_size = $ENV{MTR_PORT_GROUP_SIZE} || 20;
 
@@ -909,7 +909,7 @@ sub run_test_server ($$$) {
 	  delete $next->{reserved};
 	}
 
-	titlebar_stat(scalar(@$tests)) if $set_titlebar && $opt_titlebar;
+	titlebar_stat(scalar(@$tests)) if $set_titlebar;
 
 	if ($next) {
 	  # We don't need this any more
@@ -1246,7 +1246,6 @@ sub command_line_setup {
              'start-and-exit'           => \$opt_start_exit,
              'start'                    => \$opt_start,
 	     'user-args'                => \$opt_user_args,
-             'titlebar'                 => \$opt_titlebar,
              'wait-all'                 => \$opt_wait_all,
 	     'print-testcases'          => \&collect_option,
 	     'repeat=i'                 => \$opt_repeat,
@@ -6505,8 +6504,6 @@ Misc options
                         leaves just the server running
   start-dirty           Only start the servers (without initialization) for
                         the first specified test case
-  titlebar              Enable progress stats on the windows title bar. Works
-                        on Windows and Xterm.
   user-args             In combination with start* and no test name, drops
                         arguments to mysqld except those specified with
                         --mysqld (if any)