(fix) O3-4144 Use allowedFileExtension Hook rather than allowedExtensions from Context type.

[suubi-joshua]

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Summary

Previously the allowedFileExtensionswhich utilizes the global property, has not been used in media-uploader-component but rather was using the allowedExtensions from the CameraMediaUploaderContextType . Which I think was creating the issue of the file extensions not showing.

Screenshots

Related Issue

https://openmrs.atlassian.net/browse/O3-4144

Other

[suubi-joshua]

@denniskigen and @ibacher