De-Select button on Tune Loader only available after selecting all
Summary
The "De-Select All PVs" button in Tune Loader only appears after hitting the "Select All PVs" button. This is only a minor inconvenience since the button can be reached by clicking the "Select All PVs" button. This might not be obvious to a user though and could cause inconvenience if a user has manually selected several PVs and wishes to de-select them all.
Steps to reproduce
Open Tune Loader and only the "Select All PVs" and "Load Selected PVs" buttons are shown.
What is the current bug behavior?
The "Deselect All PVs" button only appears when you have clicked the "Select All PVs" button.
What is the expected correct behavior?
I would suggest giving the option to de-select all whenever a user has PVs selected.
Any other reference material (i.e. relevant logs and/or screenshots)
(Paste any relevant logs - please use code blocks (```) to format console output, logs, and code as it's very hard to read otherwise.)