asg/mem-alloc: Fix typo in tests/Makefile

Use `run_tests.py` instead of `run-tests.py` in `tests/Makefile`.

Signed-off-by: Razvan Deaconescu <razvan.deaconescu@upb.ro>

tests/Makefile

@@ -31,7 +31,7 @@ check:
 
 check-fast:
 	$(MAKE) clean_src clean_snippets src snippets
-	python run-tests.py -d
+	python run_tests.py -d
 
 lint:
 	-cd .. && checkpatch.pl -f src/*.c tests/src/*.c