More accurate message when deactivating isolated components

[Robbybp]

Was confused by this message so I updated it to more accurately reflect the logic.

[ccoffrin]

Change looks good, can you add a note to the change log, then merge into master?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.71%. Comparing base (8824212) to head (9c9e295).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #943   +/-   ##
=======================================
  Coverage   93.71%   93.71%           
=======================================
  Files          43       43           
  Lines        9636     9636           
=======================================
  Hits         9030     9030           
  Misses        606      606           

Files with missing lines	Coverage Δ
src/core/data.jl	90.81% <100.00%> (ø)

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