fix(wm): include workspace rules on cached monitor

The `WorkspaceConfig` stored on `Workspace` was changed to not be
serialized, however it needs to be serialized and deserialized when
caching a monitor (after a disconnect), so that when it reconnects it is
able to read all the workspace rules, which include:

- initial_workspace_rules
- workspace_rules
- window_container_behaviour_rules
- layout_rules
- custom_layout_rules

This commit changes the serde skip to only skip if is is `None`.

This means that the `komorebic state` command will have all this
information as well and it will send it when notifying subscribers too,
which isn't good at all, so we need to find another way of excluding it
from the state.

komorebi/src/workspace.rs

@@ -92,7 +92,7 @@ pub struct Workspace {
     window_container_behaviour_rules: Option<Vec<(usize, WindowContainerBehaviour)>>,
     #[getset(get = "pub", get_mut = "pub", set = "pub")]
     float_override: Option<bool>,
-    #[serde(skip)]
+    #[serde(skip_serializing_if = "Option::is_none")]
     #[getset(get = "pub", set = "pub")]
     workspace_config: Option<WorkspaceConfig>,
 }