I10 scaler card pc correction

[Relm-Arrowny]

Fixes #1048 , simple pv correction.

Instructions to reviewer on how to test:

1. Run test
2. Confirm connection

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 97.68%. Comparing base (cdc6652) to head (b8123e1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1050   +/-   ##
=======================================
  Coverage   97.68%   97.68%           
=======================================
  Files         160      160           
  Lines        6599     6599           
=======================================
  Hits         6446     6446           
  Misses        153      153           

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[DominicOram]

Great. Checked against the synoptic

and looks correct