Fix RawPropsParser for Windows

[TatianaKapos]

Summary

Changes in 7cece34...189c2c8 broke build for Windows because of a conversion from size_t to int. Adds a static cast to int to fix the error and restore windows build

Error Message

##[error]node_modules\react-native\ReactCommon\react\renderer\core\RawPropsParser.cpp(100,42): Error C2220: the following warning is treated as an error
     3>D:\a\_work\1\s\node_modules\react-native\ReactCommon\react\renderer\core\RawPropsParser.cpp(100,42): error C2220: the following warning is treated as an error [D:\a\_work\1\s\vnext\Microsoft.ReactNative\Microsoft.ReactNative.vcxproj]
##[warning]node_modules\react-native\ReactCommon\react\renderer\core\RawPropsParser.cpp(100,42): **Warning C4267: '=': conversion from 'size_t' to 'int', possible loss of data**
     3>D:\a\_work\1\s\node_modules\react-native\ReactCommon\react\renderer\core\RawPropsParser.cpp(100,42): warning C4267: '=': conversion from 'size_t' to 'int', possible loss of data [D:\a\_work\1\s\vnext\Microsoft.ReactNative\Microsoft.ReactNative.vcxproj]

Changelog

[General] [Fixed] - Restore Windows build with RawPropsParser.cpp

Test Plan

Tested locally and changes pass in the react-native-windows pipeline, change is being merged into the main branch of react-native-windows.

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@javache has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @TatianaKapos in 2d64d1d.

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