Fix unit tests to execute successfully

The unit tests were not started in the expected directory and
basically wiping the source so there was nothing to run.

Signed-off-by: Rob Crittenden <rcritten@redhat.com>

tests/tests.yml

@@ -10,11 +10,8 @@
     - python3-ply
     tests:
     - unittests:
-        dir: "source/python3"
+        dir: ./source/test
         run: >-
-            rm -rf ply* &&
-            pushd test &&
             ./cleanup.sh &&
             python3 testlex.py &&
-            python3 testyacc.py &&
-            popd
+            python3 testyacc.py