ide/Project Settings/Workspace: (#815) Fixed env vars partially entered going away on switching tabs
- The reload is only needed on creation of the Project Settings dialog, as it is always constructed
  right before showing the dialog. The env. vars with only name or value entered will not be saved
  however after closing the dialog. The only question that remains is whether we would like to allow
  defining a variable to an empty value or not, so as to clear existing values in the environment.