Revert "Add plone.formwidget.namedfilebuild to package checkouts"

This reverts commit 90c92100369a0b057657907c66ef77f1da589eb9.
Manually revert @thet's commit 8946b02f43cc474c22589b49660680f1d48e1ba4 since it broke the build.
Add plone.formwidget.namedfile to package checkouts
Bump plone.app.blob to 1.5.10