capabilities: fix assignment to default value of non-standard DotvvmP… #3179

Job	Run time
.NET unit tests (ubuntu-latest)	2m 45s
JS unit tests	1m 6s
.NET unit tests (windows-2022)	7m 30s
Build all projects without errors	10m 57s
Build published projects without warnings (Release)	2m 38s
.NET unit tests (macOS-latest)	2m 42s
Build published projects without warnings (Debug)	2m 42s
UI tests (chrome, ubuntu-latest, Production, Default)	17m 2s
UI tests (chrome, windows-2022, Development, Default)	4m 13s
UI tests (firefox, ubuntu-latest, Development, Default)	23m 25s
UI tests (firefox, ubuntu-latest, Production, Default)	24m 2s
UI tests (firefox, ubuntu-latest, Development, ExperimentalFeaturesTests)	22m 56s
UI tests (chrome, ubuntu-latest, Production, ExperimentalFeaturesTests)	17m 39s
	2h 19m 37s

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