Fix `--nilInit insert` being applied to computed property

[rakuyoMo]

Fixed

This PR mainly fixes the following issues:

• Fixed the issue that the newly added --nilInit insert option for redundantNilInit in 0.54.0 was incorrectly applied to computed properties.

Also I fixed some test case errors related to --nilInit insert.

[codecov[bot]]

Codecov Report

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

Project coverage is 96.11%. Comparing base (dd989a4) to head (836d8d7). Report is 11 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1735 +/- ## =========================================== + Coverage 95.21% 96.11% +0.90% =========================================== Files 20 20 Lines 22882 23973 +1091 =========================================== + Hits 21786 23041 +1255 + Misses 1096 932 -164 ```

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