At least with Cordova 7.0 and Cordova iOS 4.4.0 there is no need to change the source code of the plugin. You can simply add the following line to your config.xml file, and the counter will look white, not gray.
<preference name="TopActivityIndicator" value="whiteLarge" />
NOTE The Apache Cordova documentation is a bit confusing when it comes to the counter. The config.xml says the following about TopActivityIndicator :
Controls the appearance of a small icon in the status bar, which indicates significant processor activity.
I believe the statement refers to the following counter:

However, at least on Cordova 7.0 iOS, changing the TopActivityIndicator affects the appearance of the counter that appears in the middle of the screen when the application opens. Example whiteLarge example:

Hope this helps.
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