开关字段变更

review by 枪兵

@@ -510,7 +510,7 @@
         webViewEngineClass = defaultWebViewEngineClass;
     }
 
-    NSString *useWK = [[NSUserDefaults standardUserDefaults] objectForKey:@"USE_WK"];
+    NSString *useWK = [[NSUserDefaults standardUserDefaults] objectForKey:@"CDV_USE_WK"];
     if ([useWK isKindOfClass:NSString.class]
         && [useWK isEqualToString:@"N"]) {
         webViewEngineClass = @"CDVUIWebViewEngine";