Rename Un/Set/ToggleUrgent to Un/Set/ToggleWindowUrgent

Overlooked this when reviewing. This change is not cfg-breaking (since you
can't bind these directly), but it does break calling these actions through
IPC. I don't imagine they are widely used though, and the original PR author
who also implemented urgency for bars said he didn't use these actions either.

src/input/mod.rs

@@ -1982,7 +1982,7 @@ impl State {
                     self.niri.queue_redraw_all();
                 }
             }
-            Action::ToggleUrgent(id) => {
+            Action::ToggleWindowUrgent(id) => {
                 let window = self
                     .niri
                     .layout
@@ -1994,7 +1994,7 @@ impl State {
                 }
                 self.niri.queue_redraw_all();
             }
-            Action::SetUrgent(id) => {
+            Action::SetWindowUrgent(id) => {
                 let window = self
                     .niri
                     .layout
@@ -2005,7 +2005,7 @@ impl State {
                 }
                 self.niri.queue_redraw_all();
             }
-            Action::UnsetUrgent(id) => {
+            Action::UnsetWindowUrgent(id) => {
                 let window = self
                     .niri
                     .layout