A new report from AppleInsider suggests that Apple may be tightening its new USB Restricted Mode even more, following a report last week that security researchers had found a loophole that could be used to work around the new security feature. While we have been unable to reproduce this in our own testing, according to AppleInsider, the fourth beta of iOS 12 has now removed the one-hour window during which a USB data device can be connected to an…