Use 'repeating_spell' to attach listener, since repeating section is (#5206)

named 'repeating_spell'.

Shadowrun5thEdition/Shadowrun5thEdition.html

@@ -3948,7 +3948,7 @@
 	    });
 
 	//PC SPELLS/PREPS/RITUALS
-	  	['repeating_spells','repeating_preps','repeating_ritual'].forEach(field => {
+	  	['repeating_spell','repeating_preps','repeating_ritual'].forEach(field => {
 	        // Attach listener
 	        on(`change:${field}`, (eventInfo) => {
 	        	const source = eventInfo.sourceAttribute;