馃崚 trash: Optimize trashimpl::adaptTrashSize and trashimpl: optimize TrashSizeCache::calculateSize
Make TrashSizeCache::calculateSize not check modification dates.
This divides by two the number of stats run for each file already in the trash each time a file is moved into the trash.
CCBUG: 461847 (cherry picked from commit 0ab81b6b)
Avoid calling multiple times TrashSizeCache.calculateSize when freeing space in trash
(cherry picked from commit 0b5a25ae)