Update category to uppercase in metadata

Author: junaid7haque

icons/R-ICO-012337.xml

@@ -1,10 +1,10 @@
 <metadata>
 	<categories>
-		<category>arrow</category>
+		<category>ARROW</category>
 	</categories>
 	<person role="designer" url="https://graphsolutions.co.uk">Cristoffer Sevilla</person>
 	<name>No transformation arrow</name>
 	<description>An arrow that represents that the transformation of components is not happening due to a disease related process</description>
 	<info>https://reactome.org/icon-info</info>
 	<skip>true</skip>
-</metadata>
+</metadata>