It just ensures that the default values defined by [`pluginInitialize()`](https://github.com/dpa99c/cordova-plugin-inappbrowser/blob/CB-7179/src/ios/CDVInAppBrowser.m#L31) are set right away at app startup. I don't remember the exact reason it was needed (it's been a few months since I created this PR) but I'm pretty sure it was necessary. The change is minimal and will not cause side effects.
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