Fix class browser example in Pharo12 and also update the correct version number...

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01% :warning:

Comparison is base (2cdca05) 54.15% compared to head (515e3d8) 54.15%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1373 +/- ## ========================================== - Coverage 54.15% 54.15% -0.01% ========================================== Files 8883 8883 Lines 72141 72135 -6 ========================================== - Hits 39067 39062 -5 + Misses 33074 33073 -1 ``` | [Files Changed](https://app.codecov.io/gh/SeasideSt/Seaside/pull/1373?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SeasideSt) | Coverage Δ | | |---|---|---| | [...ackage/WAPharoInspector.class/instance/evaluate.st](https://app.codecov.io/gh/SeasideSt/Seaside/pull/1373?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SeasideSt#diff-cmVwb3NpdG9yeS9TZWFzaWRlLVBoYXJvLURldmVsb3BtZW50LnBhY2thZ2UvV0FQaGFyb0luc3BlY3Rvci5jbGFzcy9pbnN0YW5jZS9ldmFsdWF0ZS5zdA==) | `0.00% <ø> (ø)` | | | [...ge/GRPlatform.extension/instance/seasideVersion.st](https://app.codecov.io/gh/SeasideSt/Seaside/pull/1373?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SeasideSt#diff-cmVwb3NpdG9yeS9TZWFzaWRlLUNvcmUucGFja2FnZS9HUlBsYXRmb3JtLmV4dGVuc2lvbi9pbnN0YW5jZS9zZWFzaWRlVmVyc2lvbi5zdA==) | `100.00% <100.00%> (ø)` | | | [...BasedBrowser.class/instance/messageCategoryList.st](https://app.codecov.io/gh/SeasideSt/Seaside/pull/1373?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SeasideSt#diff-cmVwb3NpdG9yeS9TZWFzaWRlLVBoYXJvLURldmVsb3BtZW50LnBhY2thZ2UvV0FSUGFja2FnZUJhc2VkQnJvd3Nlci5jbGFzcy9pbnN0YW5jZS9tZXNzYWdlQ2F0ZWdvcnlMaXN0LnN0) | `100.00% <100.00%> (ø)` | |

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