Drone: Revert "Debugging" commit. Fix env section

Ok, now the builds should be faster :)

.drone.yml

@@ -2,7 +2,6 @@ image: wagtail-ci
 script:
  - python3.4 setup.py install
  - pip3.4 install -r requirements-dev.txt
- - env
- - python3.4 runtests.py --keepdb -v3
-environment:
+ - python3.4 runtests.py --keepdb
+env:
  - DATABASE_NAME=/base-dbs/wagtail.v1.0.sqlite