Fix category casing in R-ICO-014872.xml

changed Compound to compound

Author: junaid7haque

icons/R-ICO-014872.xml

@@ -1,6 +1,6 @@
 <metadata>
 	<categories>
-		<category>Compound</category>
+		<category>compound</category>
 	</categories>
 	<person role="curator" orcid="0000-0001-5193-0855">Bruce May</person>
 	<person role="designer" url="https://graphsolutions.co.uk">Cristoffer Sevilla</person>
@@ -13,4 +13,4 @@
 			<id>CHEBI:26561</id>
 		</reference>
 	</references>
-</metadata>
+</metadata>