Elide `simplistic_editor` (#1940)

## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [x] I signed the [CLA].
- [x] I read the [Contributors Guide].
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] All existing and new tests are passing.

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[Flutter Style Guide]:
https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo
[CLA]: https://cla.developers.google.com/
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[Contributors Guide]:
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tool/flutter_ci_script_master.sh

@@ -63,7 +63,8 @@ declare -ar PROJECT_NAMES=(
     "simple_shader"
     # TODO(DomesticMouse): Dependency 'flutter_layout_grid' fails to compile. https://github.com/shyndman/flutter_layout_grid/issues/91
     # "simplistic_calculator"
-    "simplistic_editor"
+    # TODO(DomesticMouse): The named parameter 'onLiveTextInput' is required, but there's no corresponding argument.
+    # "simplistic_editor"
     "testing_app"
     "veggieseasons"
     "web_embedding/element_embedding_demo"