FIX: ctrlenv PYDM_DISPLAYS_PATH

[ZLLentz]

Description

Set up the previously forgotten PYDM_DISPLAYS_PATH in ctrlenv_setup.sh
This will point first to our released screens area, and then second to the dev screens area.

Motivation and Context

We had some screens previously that relied on this environment variable being set in order to locate some displays to embed in the screen.

One example is the KFE vacuum screen: https://github.com/pcdshub/lcls-pydm-vacuum/blob/62ca8dfbe53e60467e46121ba589ff8ab3116a2a/screens/sxrVac.ui#L1168

For context, here's how it was set up previously for dev_conda and pcds_conda:

engineering_tools/scripts/shared_conda_setup.sh

Line 116 in 184a6fa

export PYDM_DISPLAYS_PATH="${PCDSDEVICES_PROD_UI}:${TYPHOS_PROD_DEVICES_UI}:${PCDSDEVICES_DEV_UI}:${EPICS_DEV}/screens/pydm:${EPICS_DEV}"

Compared to before, I have:

• Removed all dedicated dev typhos directories, because I don't want to deploy typhos screens like that any more
• Add in the prod/released ui directory, because I want people to be able to do e.g. common/v1.0.0/screen_name.ui as a versioned embedded display. (It also seemed strange to me that only the dev directory had path support here).

How Has This Been Tested?

I made sure the KFE vacuum screen opened correctly with this environment variable set. (Previously, it opened up with errors)

Where Has This Been Documented?

Here only