Enable conversions.wast spec test (#8528)

The test already passes and was likely fixed by #8472.
test/spec/conversions.wast is an old version of the upstream spec test
that wasn't updated. Remove it since we now test against the newer
version.

Part of #8261.

Author: stevenfontanella

scripts/test/shared.py

@@ -412,7 +412,6 @@ def get_tests(test_dir, extensions=[], recursive=False):
     'binary.wast',   # Missing data count section validation
     'comments.wast',  # Issue with carriage returns being treated as newlines
     'const.wast',    # Hex float constant not recognized as out of range
-    'conversions.wast',  # Promoted NaN should be canonical
     'data.wast',    # Fail to parse data segment offset abbreviation
     'elem.wast',    # Requires modeling empty declarative segments
     'func.wast',    # Duplicate parameter names not properly rejected