fix: wrong its ready condition during image in-place update

[free6om]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 60.61%. Comparing base (fe24a3a) to head (b3530a1).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/controller/instanceset/reconciler_update.go	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8505      +/-   ##
==========================================
+ Coverage   60.35%   60.61%   +0.25%     
==========================================
  Files         357      357              
  Lines       42555    42554       -1     
==========================================
+ Hits        25684    25793     +109     
+ Misses      14559    14451     -108     
+ Partials     2312     2310       -2     

Flag	Coverage Δ
unittests	60.61% <60.00%> (+0.25%)	⬆️

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