DiscIO: Make use of fmt-capable panic alerts

Migrates the DiscIO code over to fmt.

Source/Core/DiscIO/VolumeWii.cpp

@@ -92,7 +92,7 @@ VolumeWii::VolumeWii(std::unique_ptr<BlobReader> reader)
         {
           // This check is normally done by ES in ES_DiVerify, but that would happen too late
           // (after allocating the buffer), so we do the check here.
-          PanicAlert("Invalid TMD size");
+          PanicAlertFmt("Invalid TMD size");
           return INVALID_TMD;
         }
         std::vector<u8> tmd_buffer(*tmd_size);