When reading the size of "files" mountpoints need to be excluded

The versions and trashbin app are now passing "includeMountPoints=false"
to "getFileInfo()" to make sure that the calculated total size doesn't
include mount points like Shared or external storage.

This is because the default call (legacy) used to return the size of
mount points as well.

Fixes #6731
Merge pull request #6851 from owncloud/files-fixtrashandversionrootsizecalc

When reading the size of "files" mountpoints need to be excluded