PyTerminal: use Pyodide instead of Python (#1833)

pyscript.core/test/py-terminal.html

@@ -13,7 +13,7 @@
             def greetings(event):
                 print('hello world')
         </script>
-        <py-script terminal>
+        <py-script worker terminal>
             import sys
             from pyscript import display
             display("Hello", "PyScript Next - PyTerminal", append=False)