cmd_focus: show scratchpad if hidden
cmd_focus: show scratchpad if hidden

If a scratchpad container is hidden, it is still focusable using
criteria and should be shown. This fixes a segfault when attempting to
rebase the cursor since previously the scratchpad container would not be
on any output.

1ace/sway,ascent12/sway,ascent12/sway,ascent12/sway,1ace/sway,1ace/sway,SirCmpwn/sway