[iOS] fileNameOptional doesn't work in top header when open file for docx file

[jiandian]

when I open a PDF file, the top title is the file name that I passed in, and then open a Docx file, the top title is still the file name of PDF file, but in the Shared module, that name is correct. After many attempts, I found that when I opened the Docx file, there would be such a problem that the title would always be the title of the last open file's fileNameOptional.

[menga33]

// var SavePath = Platform.OS === 'ios' ? RNFS.MainBundlePath : RNFS.DocumentDirectoryPath;
var SavePath = RNFS.DocumentDirectoryPath;