Running `printf "foo\nbar\n" | bemenu --filter foo` no results would
show up until something set the dirty state (like interacting with the
keyboard, e.g. deleting a character).

This would only happen on wayland, due to the render implementation not
considering the dirty state when the window was not yet created and then
just overwriting `menu->dirty` with `false`.

Signed-off-by: Robert Günzler <[email protected]>

Signed-off-by: Robert Günzler <[email protected]>

This lets us select fully non-interactive if we have a perfect match

Signed-off-by: Robert Günzler <[email protected]>