[threads] Fix typo in ref.i31_shared validation

And tighten up the test so it would have caught the problem.

src/wasm/wasm-validator.cpp

diff --git a/src/wasm/wasm-validator.cpp b/src/wasm/wasm-validator.cpp
index fd78efe..9994adf 100644
--- a/src/wasm/wasm-validator.cpp
+++ b/src/wasm/wasm-validator.cpp
@@ -2729,7 +2729,7 @@
     getModule()->features.hasGC(), curr, "ref.i31 requires gc [--enable-gc]");
   if (curr->type.isRef() && curr->type.getHeapType().isShared()) {
     shouldBeTrue(
-      getModule()->features.hasGC(),
+      getModule()->features.hasSharedEverything(),
       curr,
       "ref.i31_shared requires shared-everything [--enable-shared-everything]");
   }

test/lit/validation/shared-ref-i31.wast

diff --git a/test/lit/validation/shared-ref-i31.wast b/test/lit/validation/shared-ref-i31.wast
index 222bd05..aaab2f4 100644
--- a/test/lit/validation/shared-ref-i31.wast
+++ b/test/lit/validation/shared-ref-i31.wast
@@ -1,6 +1,6 @@
 ;; Test that ref.i31_shared requires shared-everything threads
 
-;; RUN: not wasm-opt %s 2>&1 | filecheck %s --check-prefix NO-SHARED
+;; RUN: not wasm-opt %s -all --disable-shared-everything 2>&1 | filecheck %s --check-prefix NO-SHARED
 ;; RUN: wasm-opt %s --enable-reference-types --enable-gc --enable-shared-everything -o - -S | filecheck %s --check-prefix SHARED
 
 ;; NO-SHARED: ref.i31_shared requires shared-everything [--enable-shared-everything]