Fix Heading Border Color on Dark Mode

/* Fix Heading Border Color on Dark Mode  */
.jnews-dark-mode .jeg_postblock .jeg_block_heading.jeg_block_heading_1,
.jnews-dark-mode .jeg_postblock .jeg_block_heading.jeg_block_heading_6,
.jnews-dark-mode .jeg_block_heading.jeg_block_heading_1,
.jnews-dark-mode .jeg_block_heading.jeg_block_heading_6 {
    border-color: var(--j-border-color);
}