filemanager_pre.sh: add old filesX

Version 1.53

Feature
Finished

As some were using filemanager_pre.sh to pre-scan uploaded files, the newer file[] method only showed a single file, when multiple might have been uploaded. This change will include the old files1, files1, files3 values to the filemanager_pre.sh script, in addition to last file[] (which isn't of much use if multiple files are uploaded), and will also set: duplicate_filex_format=1 so you'll know the last "filesX" value and "file" will be the same. Note, that you can alternatively use the file_manager_upload_post.sh, which is going to be called for each uploaded file (multile files = multiple calls)

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