Fox Corp.’s $787.5 million settlement with Dominion Voting Systems over defamation charges is eye-popping, but the ultimate cost to the media company is likely to be much lower.Fox settled with Dominion last week over charges that Fox News baselessly accused the company of rigging its voting machines against former President Donald Trump in 2020. It was the most-watched media libel case in decades.On Monday, Fox said it had agreed to part ways with Tucker Carlson, its popular and controversial primetime host. It said …