docker: Fix memory limit slider activation (#9412)
docker: Fix memory limit slider activation (#9412)

Slider should not be disabled if data is undefined. Instead checkbox
value should be checked.

Fixes #8634 
Closes #9412
cockpituous/cockpit,andreasn/cockpit,cockpit-project/cockpit,mvollmer/cockpit,martinpitt/cockpit,cockpituous/cockpit,deryni/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,mvollmer/cockpit,andreasn/cockpit,SotolitoLabs/cockpit,andreasn/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,cockpit-project/cockpit,mvollmer/cockpit,mareklibra/cockpit,andreasn/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,garrett/cockpit,mareklibra/cockpit,deryni/cockpit,mvollmer/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,deryni/cockpit,SotolitoLabs/cockpit,mareklibra/cockpit,deryni/cockpit,deryni/cockpit,andreasn/cockpit,SotolitoLabs/cockpit,martinpitt/cockpit,andreasn/cockpit,martinpitt/cockpit,cockpituous/cockpit,garrett/cockpit,garrett/cockpit,garrett/cockpit,martinpitt/cockpit,mareklibra/cockpit,andreasn/cockpit,garrett/cockpit,deryni/cockpit,mareklibra/cockpit,cockpituous/cockpit,cockpituous/cockpit,mareklibra/cockpit,moraleslazaro/cockpit,mareklibra/cockpit,deryni/cockpit,cockpituous/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit