Formatting changes & proxy delete support

SB.js

@@ -99,18 +99,23 @@ function configProxy() {
     });
 	
     var handler = {
-        set: function(obj, prop, value) {
+        set(obj, prop, value) {
             SB.localConfig[prop] = value;
 
             chrome.storage.sync.set({
                 [prop]: encodeStoredItem(value)
             });
         },
-        get: function(obj, prop) {
+
+        get(obj, prop) {
             let data = SB.localConfig[prop];
             if(data instanceof Map) data = new MapIO(prop);
 
             return obj[prop] || data;
+        },
+	
+        deleteProperty(obj, prop) {
+	    chrome.storage.sync.remove(key);
         }
 		
     };
@@ -131,7 +136,7 @@ function migrateOldFormats() { // Convert sponsorTimes format
     for (key in SB.localConfig) {
         if (key.startsWith("sponsorTimes") && key !== "sponsorTimes" && key !== "sponsorTimesContributed") {
             SB.config.sponsorTimes.set(key.substr(12), SB.config[key]);
-            chrome.storage.sync.remove(key);
+            delete SB.config[key];
         }
     }
 }