Simplify ElectronAnalyserDetector driver reference

[oliwenmandiamond]

Fixes #1579

Instructions to reviewer on how to test:

1. Check tests pass

Checks for reviewer

• Would the PR title make sense to a scientist on a set of release notes
• If a new device has been added does it follow the standards
• If changing the API for a pre-existing device, ensure that any beamlines using this device have updated their Bluesky plans accordingly
• Have the connection tests for the relevant beamline(s) been run via dodal connect ${BEAMLINE}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.87%. Comparing base (17b1eb4) to head (535020c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1592      +/-   ##
==========================================
- Coverage   98.88%   98.87%   -0.01%     
==========================================
  Files         260      260              
  Lines        9469     9461       -8     
==========================================
- Hits         9363     9355       -8     
  Misses        106      106              

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[olliesilvester]

Looks good. That CI failure is unrelated I think