Add the ScreenReaderModeEnabled property to formatting (#4970)

Add the `ScreenReaderModeEnabled` property to formatting so it's displayed in the default formatting for `Get-PSReadLineOption`.

Author: daxian-dbw

PSReadLine/PSReadLine.format.ps1xml

@@ -144,6 +144,9 @@ $d = [Microsoft.PowerShell.KeyHandler]::GetGroupingDescription($_.Group)
               <ListItem>
                 <PropertyName>ShowToolTips</PropertyName>
               </ListItem>
+              <ListItem>
+                <PropertyName>ScreenReaderModeEnabled</PropertyName>
+              </ListItem>
               <ListItem>
                 <PropertyName>ViModeIndicator</PropertyName>
               </ListItem>