Environment Var Wizard: Improve deletion of environment variables

Deletion of environment variable does not match user expectation. If I delete an environment variable which has been added in earlier opened and closed Env. Var wizard, this variable has prefix [deleted]. I don't think this is good practice, we should be consistent across all wizards and dialog, so once user select an env var in table and push Delete button, value should be removed from the table. No labelling should be done here, the table should reflect real current state of environment variable (what it is gonna look like once I hit Finish button).