Remove y-021 from ignore file now that it's no longer present

se-lint-ignore.xml

@@ -15,10 +15,6 @@
 			<code>y-019</code>
 			<reason>Two instances. First instance is of a quotation mark that crosses element boundaries due to the div tags for the brackets. Second instance is because of a block quotation of dramatic markup.</reason>
 		</ignore>
-		<ignore>
-			<code>y-021</code>
-			<reason>This is also because of the block quotation of dramatic markup.</reason>
-		</ignore>
 		<ignore>
 			<code>y-031</code>
 			<reason>The matched text is not a typo.</reason>