Pass inserted flag correctly to deferred props in test renderers

[agubler]

Type: bug

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier as per the readme code style guidelines
• Unit or Functional tests are included in the PR

Description:

For deferred properties the renderers resolve to the "final", i.e. run the deferred properties twice but it doesn't pass the inserted flag correctly.

This passes the inserted flag as true for the second process.

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[codecov]

Codecov Report

Merging #881 (3571dcd) into master (69a6a61) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #881   +/-   ##
=======================================
  Coverage   94.45%   94.45%           
=======================================
  Files         127      127           
  Lines        8010     8010           
  Branches     1872     1874    +2     
=======================================
  Hits         7566     7566           
  Misses        444      444           

Impacted Files	Coverage Δ
src/testing/decorate.ts	98.01% <100.00%> (ø)
src/testing/harness/harness.ts	93.87% <100.00%> (ø)
src/testing/harness/support/selector.ts	100.00% <100.00%> (ø)
src/testing/renderer.ts	97.32% <100.00%> (ø)

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