casa5* containers title re-labelling

[helenkirk]

When CASA5.* containers are initially launched, the title/header of that terminal initially has the correct & helpful label (e.g., casa5.4.1-32). But when casa is actually initiated (i.e., typing 'casa' in the container), the title/header of the terminal changes to something much less useful - something like 'iPython [directory name]...'. Toby confirms that this change does not happen in other, non-ARCADE installations of casa5* versions.

While this issue won't directly hinder the user's ability to run casa scripts, it will make it much more challenging if they are trying to manage and differentiate between simultaneously running casa containers on arcade.