clock: Also update clock in heaven and level_loading states

For proper operation of the clock, it needs to be updated in those
states as well.

src/states/heaven.rs

@@ -77,7 +77,12 @@ impl gamestate::State for HeavenState {
             .unwrap();
     }
 
-    fn update(&mut self, _timestamp: f64) -> gamestate::Transition {
+    fn update(&mut self, timestamp: f64) -> gamestate::Transition {
+        self.resources
+            .get_mut::<resources::Clock>()
+            .unwrap()
+            .update(timestamp);
+
         {
             let rendering = self.resources.get_mut::<resources::Rendering>().unwrap();
             rendering.set_fill_style(&colors::BACKGROUND);

src/states/level_loading.rs

@@ -72,7 +72,12 @@ impl gamestate::State for LevelLoadingState {
         gamestate::Transition::Loop
     }
 
-    fn update(&mut self, _timestamp: f64) -> gamestate::Transition {
+    fn update(&mut self, timestamp: f64) -> gamestate::Transition {
+        self.resources
+            .get_mut::<resources::Clock>()
+            .unwrap()
+            .update(timestamp);
+
         {
             let rendering = self.resources.get_mut::<resources::Rendering>().unwrap();
             rendering.set_fill_style(&colors::BACKGROUND);