Fix C&P mistake in test

Author: Flamefire

test/framework/sandbox/easybuild/easyblocks/generic/bar.py

@@ -40,7 +40,7 @@ class dummy2(dummy1):
     """Same but with inheritance"""
 
 
-class dummy1:
+class dummy3:
     """Class without inheritance before the real easyblock to verify the regex not being too greedy"""