capabilities: fix assignment to default value of non-standard DotvvmP… #3169

Job	Run time
.NET unit tests (ubuntu-latest)	2m 57s
.NET unit tests (windows-2022)	11m 49s
Build all projects without errors	9m 16s
.NET unit tests (macOS-latest)	3m 55s
Build published projects without warnings (Release)	2m 52s
JS unit tests	57s
Build published projects without warnings (Debug)	2m 30s
UI tests (chrome, ubuntu-latest, Production, Default)	14m 24s
UI tests (chrome, windows-2022, Development, Default)	28m 3s
UI tests (firefox, ubuntu-latest, Development, Default)	19m 7s
UI tests (firefox, ubuntu-latest, Production, Default)	17m 30s
UI tests (firefox, ubuntu-latest, Development, ExperimentalFeaturesTests)	18m 54s
UI tests (chrome, ubuntu-latest, Production, ExperimentalFeaturesTests)	15m 25s
	2h 27m 39s

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