NativePicker - remove panning (it was enabled by mistake in the Dialog migration) (#787)

(cherry picked from commit 20ca2c5)

Author: M-i-k-e-l

src/components/picker/NativePicker.js

@@ -63,7 +63,7 @@ class NativePicker extends BaseComponent {
       <PickerDialog
         {...this.getThemeProps()}
         visible={showDialog}
-        disablePan
+        panDirection={null}
         onDismiss={this.onCancel}
         onValueChange={this.onValueChange}
         selectedValue={selectedValue}