[GR-13445] Adopt the new property for pre-initialization

Author: eregon

mx.graalpython/native-image.properties

@@ -3,7 +3,7 @@
 
 Requires = language:regex language:llvm
 
-JavaArgs = -Xmx4G -Dpolyglot.engine.PreinitializeContexts=python
+JavaArgs = -Xmx4G -Dpolyglot.image-build-time.PreinitializeContexts=python
 
 Args = -H:MaxRuntimeCompileMethods=7000 \
        -H:+AddAllCharsets \