Fix transfocator timeout error on repeated sets

[olliesilvester]

Fixes DiamondLightSource/mx-bluesky#1594

Fixes this by replacing the previous logic with a sleep. This sleep can be removed once https://jira.diamond.ac.uk/browse/I04-1100 is done

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 99.14%. Comparing base (07c1416) to head (7999d4a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1885      +/-   ##
==========================================
- Coverage   99.14%   99.14%   -0.01%     
==========================================
  Files         304      304              
  Lines       11509    11508       -1     
==========================================
- Hits        11411    11410       -1     
  Misses         98       98              

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[jacob720]

Looks good, just fix lint