manage_config_workflow_page, fix html

For threshold rows, fix html.
When user don't have access level to modify, in some situation,
the status table cell was not visible due to html error.

Fixes: #21583

manage_config_workflow_page.php

@@ -286,7 +286,7 @@ function threshold_row( $p_threshold ) {
 		echo '</select> </td>' . "\n";
 		$g_can_change_flags = true;
 	} else {
-		echo '<td' . $t_color . '>' . MantisEnum::getLabel( lang_get( 'status_enum_string' ), $t_project ) . '&#160;</td>' . "\n";
+		echo '<td class="' . $t_color . '">' . MantisEnum::getLabel( lang_get( 'status_enum_string' ), $t_project ) . '&#160;</td>' . "\n";
 		echo '<td>' . MantisEnum::getLabel( lang_get( 'access_levels_enum_string' ), config_get_access( $p_threshold ) ) . '&#160;</td>' . "\n";
 	}