Try fixing macos CI, take 2

test/run-spec-test.py

@@ -229,8 +229,9 @@ class Wasm3():
         raise Exception(error)
 
     def _write(self, data):
-        #if not self._is_running():
-        #    raise Exception("Not running")
+        if not self._is_running():
+            self.load(self.loaded)
+            #raise Exception("Not running")
         self.p.stdin.write(data.encode("utf-8"))
         self.p.stdin.flush()