Fix copy-paste error

This does not address the CI-reported python3.6 error, but it is a
necessary fix in the meanwhile.

References:
* [AC-178] Add website repository's sample runner to
  CASE-Utilities-Python repository

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

Author: ajnelson-nist

tests/Makefile

@@ -74,7 +74,7 @@ all-case_sparql_construct: \
 all-case_sparql_select: \
   .venv.done.log
 	$(MAKE) \
-	  --directory case_sparql_construct
+	  --directory case_sparql_select
 
 # These check calls are provided in preferred run-order.
 check: \