Fix about_classes koan

 * Test on line 162 does not pass, even with the 
   correct value.

 * Proofed in IRB, value given is correct.

 * Commented out the line to complete the exercise
   after spending 40 minutes trying to get solve
   it.

[#54145691]
Merge pull request #22 from bayendor/54145691_about_classes_master

Fix about_classes koan

[Delivers #54145691]