Fixing Cubed Sphere Scalar Tracer

[cshsgy]

• Fixed cubed sphere tracer transport communication issues
• Turned off the decomposition for scalars but kept on for hydro variables

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.17%. Comparing base (2a8e73f) to head (20de3a4).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #158 +/- ## ======================================= Coverage 99.17% 99.17% ======================================= Files 31 31 Lines 1574 1574 ======================================= Hits 1561 1561 Misses 13 13 ```

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[chengcli]

closed by #164