Remove the multipleAttachmentUploadEnabled feature flag.

ElementX/Sources/Screens/MediaPickerScreen/DocumentPicker.swift

@@ -41,6 +41,8 @@ struct DocumentPicker: UIViewControllerRepresentable {
     }
     
     func updateUIViewController(_ uiViewController: UIDocumentPickerViewController, context: Context) {
+        // Override the app wide tint color (currently set to `.compound.texActionPrimary
+        // as it's not legible enough in dark mode
         uiViewController.view.tintColor = .compound.textActionAccent
     }