Make the support for unencrypted Wii disc images less broken #6947
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These disc images are only used on dev units and not retail units. There are two important differences compared to normal Wii disc images:
Our old implementation was just guesswork and doesn't work at all. According to testing by @GerbilSoft, this PR's implementation is able to read and extract files in the filesystem correctly, but the tested game still isn't able to boot. (It's thanks to their info about unencrypted disc images that I was able to make this PR.)