OnyxPulse: Reduce the file size of the screenshot and adjusted the theme tags. (#7822)

onyxpulse/style.css

@@ -11,7 +11,7 @@ Version: 1.0.0
 License: GNU General Public License v2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
 Text Domain: onyxpulse
-Tags: three-column, block-patterns, block-styles, full-site-editing, rtl-language-support, threaded-comments, translation-ready
+Tags: three-columns, block-patterns, block-styles, full-site-editing, rtl-language-support, threaded-comments, translation-ready
 */
 
 /* Progresive enhancement to reduce widows and orphans. */