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

[jbrichau]

No description provided.

[codecov]

Codecov Report

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

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

Additional details and impacted files

@@            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	Coverage Δ
...ackage/WAPharoInspector.class/instance/evaluate.st	0.00% <ø> (ø)
...ge/GRPlatform.extension/instance/seasideVersion.st	100.00% <100.00%> (ø)
...BasedBrowser.class/instance/messageCategoryList.st	100.00% <100.00%> (ø)

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