remove unneeded double shadow

packages/block-editor/src/components/inserter/style.scss

@@ -318,7 +318,6 @@ $block-inserter-tabs-height: 44px;
 		height: calc(100% + #{$border-width});
 		background: $gray-100;
 		border-top: $border-width solid $gray-200;
-		box-shadow: $border-width $border-width 0 0 rgba($color: #000, $alpha: 0.133); // 0.133 = $gray-200 but with alpha.
 
 		.block-editor-inserter__media-list,
 		.block-editor-block-patterns-list {
@@ -691,12 +690,6 @@ $block-inserter-tabs-height: 44px;
 			height: 100%;
 		}
 	}
-
-	// Remove doubled-up shadow that occurs when categories panel is opened, only in zoom out.
-	// Shadow cannot be removed from the source, as it is required when not zoomed out.
-	.block-editor-inserter__category-panel {
-		box-shadow: none;
-	}
 }
 
 .show-icon-labels {