Remove test suite's assumption of minify_check roundtripping perfectly (#3524)

minify_check checks that we can print and read minified wast. The test
also, however, assumed that we round-trip such things perfectly. That's
never been true, and only by chance did this go unnoticed until now,
in #3523

The specific issue happening there is that we create a block without a
name. Then we write that as text, then read it. When we read it, we give
all such blocks a name (and we rely on optimizations to remove it later
when possible - this avoids optimizing in the parser). The extra name
looks like a bug to minify_check.

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