Hide number picker if single page PDF

Author: ferndot

lib/src/viewer.dart

@@ -129,7 +129,7 @@ class _PDFViewerState extends State<PDFViewer> {
               : Container(),
         ],
       ),
-      floatingActionButton: widget.showPicker
+      floatingActionButton: widget.showPicker && widget.document.count > 1
           ? FloatingActionButton(
               elevation: 4.0,
               tooltip: widget.tooltip.jump,