Fixes#6256
## Problem
When `fileManagerSelectionType` is set to `'folders'`, clicking the **My
Device** tab/button
still opens the file picker instead of the folder picker.
The inline "browse" link in the tagline correctly respects the setting,
but
`renderMyDeviceAcquirer` in `AddFiles.tsx` always called
`triggerFileInputClick`
regardless of the `fileManagerSelectionType` prop.
## Solution
`renderMyDeviceAcquirer` now reads `fileManagerSelectionType` and calls
`triggerFolderInputClick` when set to `'folders'`, or
`triggerFileInputClick`
for `'files'` and `'both'`.
For `'both'` mode, the button defaults to file selection because a
single
HTML `<input>` cannot handle both files and folders simultaneously
(`webkitdirectory` is all-or-nothing). The folder picker remains
accessible
via the tagline's "browse folders" link.
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Co-authored-by: Prakash <qxprakash@gmail.com>