LDEV-6107 clear stale className when classloader flushes

https://luceeserver.atlassian.net/browse/LDEV-6107

Author: zspitzer

core/src/main/java/lucee/runtime/PageSourceImpl.java

@@ -1044,7 +1044,7 @@ public Resource getResourceTranslated(PageContext pc) throws ExpressionException
 
 	public void clear() {
 		mapping.clear(pcn.className);
-		pcn.page = null;
+		pcn.reset();
 	}
 
 	/**
@@ -1055,7 +1055,7 @@ public void clear() {
 	public boolean clear(ClassLoader cl) {
 		Page page = pcn.page;
 		if (page != null && page.getClass().getClassLoader().equals(cl)) {
-			pcn.page = null;
+			pcn.reset();
 			return true;
 		}
 		return false;