[ui] Reconstruction: Fix setup of temporary CameraInit nodes

[cbentejac]

Description

This PR fixes a bug introduced by #2733 which caused the setup of temporary CameraInit nodes to fail, as we were attempting to call a method from an object that had not been instantiated yet.

Temporary CameraInit nodes are used, among other things, to display the results of the LdrToHdrMerge node in the "Hdr Fusion" pipeline.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.80%. Comparing base (517a64d) to head (733f029).
Report is 2 commits behind head on develop.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2762   +/-   ##
========================================
  Coverage    77.80%   77.80%           
========================================
  Files           48       48           
  Lines         6674     6674           
========================================
  Hits          5193     5193           
  Misses        1481     1481           

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