Enable all features in wasm-shell assert failure tests (#2254)

If we don't enable features in assertion failure tests, new feature
tests fail not because they are malformed but because they have
unsupported features. It's hard to add tests because existing
`assert_invalid` tests were already failing because they have
unsupported features.

Author: aheejin

src/tools/wasm-shell.cpp

@@ -142,6 +142,7 @@ static void run_asserts(Name moduleName,
         id == ASSERT_UNLINKABLE) {
       // a module invalidity test
       Module wasm;
+      wasm.features = FeatureSet::All;
       bool invalid = false;
       std::unique_ptr<SExpressionWasmBuilder> builder;
       try {