Media: Remove accents in sanitize_file_name().
This brings some consistency with `sanitize_title()` and `sanitize_user()`.
Props tar.gz, NumidWasNotAvailable, juliobox, p_enrique, cristovaov, zodiac1978, mikeschroder, markoheijnen, chriscct7, swissspidy, DrProtocols, pento, gitlost, joemcgill, dustinbolton, programmin, Vayu, MaximeCulea, lucasbustamante, nilovelez, RavanH, audrasjb, SergeyBiryukov.
See #22363.
git-svn-id: https://develop.svn.wordpress.org/trunk@48603 602fd350-edb4-49c9-b593-d223f7449a82
c7783dc49a