capabilities: fix assignment to default value of non-standard DotvvmP… #3196

Job	Run time
JS unit tests	59s
Build all projects without errors	8m 0s
.NET unit tests (ubuntu-latest)	2m 39s
Build published projects without warnings (Release)	2m 30s
.NET unit tests (windows-2022)	9m 39s
UI tests (chrome, ubuntu-latest, Production, Default)	13m 45s
Build published projects without warnings (Debug)	5m 14s
.NET unit tests (macOS-latest)	6m 16s
UI tests (chrome, windows-2022, Development, Default)	19m 32s
UI tests (firefox, ubuntu-latest, Development, Default)	18m 6s
UI tests (firefox, ubuntu-latest, Production, Default)	17m 39s
UI tests (firefox, ubuntu-latest, Development, ExperimentalFeaturesTests)	19m 35s
UI tests (chrome, ubuntu-latest, Production, ExperimentalFeaturesTests)	14m 12s
	2h 18m 6s

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