LibGfx: Add Core::File variant of BitmapFont::write_to_file

Author: https://github.com/caoimhebyrne
Commit: c43295b668
Pull-request: https://github.com/SerenityOS/serenity/pull/18029
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/AtkinsSJ ✅
Reviewed-by: https://github.com/LucasChollet
Reviewed-by: https://github.com/thankyouverycool

Userland/Libraries/LibGfx/Font/BitmapFont.h

@@ -33,7 +33,9 @@ public:
     static RefPtr<BitmapFont> load_from_file(DeprecatedString const& path);
     static ErrorOr<NonnullRefPtr<BitmapFont>> try_load_from_file(DeprecatedString const& path);
     static ErrorOr<NonnullRefPtr<BitmapFont>> try_load_from_mapped_file(RefPtr<Core::MappedFile> const&);
+
     ErrorOr<void> write_to_file(DeprecatedString const& path);
+    ErrorOr<void> write_to_file(NonnullOwnPtr<Core::File> file);
 
     ~BitmapFont();