Varia: Reset Slideshow block list

varia/sass/blocks/_imports.scss

@@ -25,6 +25,7 @@
 @import "pullquote/style";
 @import "quote/style";
 @import "separator/style";
+@import "slideshow/style";
 @import "spacer/style";
 @import "table/style";
 @import "video/style";

varia/sass/blocks/slideshow/_style.scss

@@ -0,0 +1,6 @@
+.wp-block-jetpack-slideshow {
+	ul {
+		margin-left: 0;
+		margin-right: 0;
+	}
+}

varia/style.css

@@ -1722,6 +1722,11 @@ hr.is-style-dots:before {
 	padding-left: 0.83333rem;
 }
 
+.wp-block-jetpack-slideshow ul {
+	margin-left: 0;
+	margin-right: 0;
+}
+
 .wp-block-spacer {
 	display: block;
 	margin-bottom: 0;