`simplistic_calculator` fixed (#1939)

Fixed by https://github.com/shyndman/flutter_layout_grid/pull/92

## 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.

If you need help, consider asking for advice on the #hackers-devrel
channel on [Discord].

<!-- Links -->
[Flutter Style Guide]:
https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo
[CLA]: https://cla.developers.google.com/
[Discord]: https://github.com/flutter/flutter/wiki/Chat
[Contributors Guide]:
https://github.com/flutter/samples/blob/main/CONTRIBUTING.md

tool/flutter_ci_script_beta.sh

@@ -61,8 +61,7 @@ declare -ar PROJECT_NAMES=(
     "provider_counter"
     "provider_shopper"
     "simple_shader"
-    # TODO(DomesticMouse): Dependency 'flutter_layout_grid' fails to compile. https://github.com/shyndman/flutter_layout_grid/issues/91
-    # "simplistic_calculator"
+    "simplistic_calculator"
     "simplistic_editor"
     "testing_app"
     "veggieseasons"

tool/flutter_ci_script_master.sh

@@ -61,8 +61,7 @@ declare -ar PROJECT_NAMES=(
     "provider_counter"
     "provider_shopper"
     "simple_shader"
-    # TODO(DomesticMouse): Dependency 'flutter_layout_grid' fails to compile. https://github.com/shyndman/flutter_layout_grid/issues/91
-    # "simplistic_calculator"
+    "simplistic_calculator"
     # TODO(DomesticMouse): The named parameter 'onLiveTextInput' is required, but there's no corresponding argument.
     # "simplistic_editor"
     "testing_app"