Revert -e install in tests

Author: pdelboca

.github/workflows/test.yml

@@ -56,7 +56,7 @@ jobs:
       run: |
         pip install -r requirements.txt
         pip install -r dev-requirements.txt
-        pip install .
+        pip install -e .
         # Replace default path to CKAN core config file with the one on the container
         sed -i -e 's/use = config:.*/use = config:\/srv\/app\/src\/ckan\/test-core.ini/' test.ini
     - name: Install requirements (2.9)