[AGIPD][SlopesFF] Add the deviation for all possible memory cells

This was requested by Jola to expand the previous SlopessFF MR !613 (merged)

Description

Old AGIPD (MID and SPB) can have the challenge of reaching 352 cells with an acquisition rate 0.5

Therefore, I have removed the 352 memory cells' hard-coded value. With this, a deviation is always added to enable retrieving SlopessFF greater than or equal to the number of memory cells for the corrected data.

How Has This Been Tested?

Relevant Documents (optional)

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

Reviewers

@schmidtp @hammerd