Fix startup bug where filterList is read before being defined

Author: Nateowami

scripts/background/background.js

@@ -88,7 +88,7 @@ function init() {
 */
 function manageRequest(request) {
 	// Only run if filtering is enabled
-	if(!backloader.enabled) return;
+	if(!backloader.enabled || !filterList) return;
 
 	for(var r = 0; r < filterList.length; r++) {
 		if(!filterList[r].isEnabled) continue;