[test] Disable asan.test_externref_emjs. NFC

Should have been part of emscripten-core#21490.

Author: sbc100

test/test_core.py

@@ -9562,9 +9562,8 @@ def test_externref(self):
   })
   @requires_node
   @no_wasm2js('wasm2js does not support reference types')
+  @no_asan('https://github.com/llvm/llvm-project/pull/83196')
   def test_externref_emjs(self, dynlink):
-    if dynlink and is_sanitizing(self.emcc_args):
-      self.skipTest('https://github.com/llvm/llvm-project/pull/83196')
     self.emcc_args += ['-mreference-types']
     self.node_args += shared.node_reference_types_flags(self.get_nodejs())
     if dynlink: