Fix Konf output for demos

[jkfran]

Done

• Konf was returning values for staging (introduced on #21) that we shouldn't set for demos

QA

Install current konf with: sudo snap install konf
Check out this branch and compare that both outputs for demos are the same, eg:

konf demo ../../Workspace/snapcraft.io/konf/site.yaml --database-url postgres://postgres:POSTGRES_PW@postgres:5432/DATABASE_NAME -o domain=DEMO_DOMAIN image=IMAGE_NAME tlsName=demos-haus secretKey=demos-haus -l github.org=REPO_ORG github.repo=REPO_NAME github.pr=PR --tag IMAGE_TAG > a.yaml

./konf.py demo ../../Workspace/snapcraft.io/konf/site.yaml --database-url postgres://postgres:POSTGRES_PW@postgres:5432/DATABASE_NAME -o domain=DEMO_DOMAIN image=IMAGE_NAME tlsName=demos-haus secretKey=demos-haus -l github.org=REPO_ORG github.repo=REPO_NAME github.pr=PR --tag IMAGE_TAG > b.yaml

diff a.yaml b.yaml

The diff output should be empty

[goulinkh]

LGTM 🚀