editor: disable word-based suggestions

This turns off the default word-based suggestions. This was useful when
we didn't have proper code completion but now can be distracting.

Fixes: https://github.com/pybricks/support/issues/757

src/editor/Editor.tsx

@@ -373,6 +373,7 @@ const Editor: React.VFC = () => {
             contextmenu: false,
             rulers: [80],
             lineNumbersMinChars: 4,
+            wordBasedSuggestions: false,
         }),
         [],
     );