test: Increase Chromium window size
test: Increase Chromium window size

The default 800x600 is a bit crammed and often cuts off interesting
details when looking at failures. Bump it to 1280x1200.

Closes #8526

moraleslazaro/cockpit,martinpitt/cockpit,martinpitt/cockpit,stefwalter/cockpit,mareklibra/cockpit,garrett/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,mareklibra/cockpit,stefwalter/cockpit,garrett/cockpit,mareklibra/cockpit,SotolitoLabs/cockpit,deryni/cockpit,mareklibra/cockpit,moraleslazaro/cockpit,andreasn/cockpit,stefwalter/cockpit,moraleslazaro/cockpit,SotolitoLabs/cockpit,andreasn/cockpit,cockpit-project/cockpit,stefwalter/cockpit,mvollmer/cockpit,SotolitoLabs/cockpit,stefwalter/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,garrett/cockpit,cockpituous/cockpit,andreasn/cockpit,mvollmer/cockpit,deryni/cockpit,SotolitoLabs/cockpit,andreasn/cockpit,garrett/cockpit,cockpit-project/cockpit,mareklibra/cockpit,cockpituous/cockpit,stefwalter/cockpit,deryni/cockpit,stefwalter/cockpit,garrett/cockpit,deryni/cockpit,mareklibra/cockpit,andreasn/cockpit,mvollmer/cockpit,cockpituous/cockpit,cockpit-project/cockpit,andreasn/cockpit,martinpitt/cockpit,cockpituous/cockpit,deryni/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,SotolitoLabs/cockpit,cockpit-project/cockpit,martinpitt/cockpit,andreasn/cockpit,deryni/cockpit,mareklibra/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,deryni/cockpit,martinpitt/cockpit