Techmarket - Departments menu open by default

functions.php

function techmarket_departments_menu() {
    ?>
    <div id="departments-menu" class="dropdown departments-menu open show">
        <?php
            $departments_menu_title = techmarket_is_woocommerce_activated() ? esc_html__( 'All Departments', 'techmarket' ) : esc_html__( 'Categories', 'techmarket' );
            $departments_menu_title = apply_filters( 'techmarket_departments_menu_title', $departments_menu_title );
            $departments_menu_icon  = apply_filters( 'techmarket_departments_menu_icon', 'tm tm-departments-thin' );
        ?>
        <button class="btn dropdown-toggle btn-block" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"><i class="<?php echo esc_attr( $departments_menu_icon ); ?>"></i><span><?php echo esc_html( $departments_menu_title ); ?></span></button>
        <?php
        wp_nav_menu( apply_filters( 'techmarket_departments_menu_args', array(
            'theme_location'    => 'departments-menu',
            'container'         => false,
            'menu_class'        => 'dropdown-menu yamm departments-menu-dropdown',
            'fallback_cb'       => 'WP_Bootstrap_Navwalker::fallback',
            'walker'            => new WP_Bootstrap_Navwalker(),
        ) ) );
        ?>
    </div><!-- #departments-menu -->
    <?php
}

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