Fix indicator lights for active signals across save/load

src/scene/scene.c

@@ -92,6 +92,12 @@ void sceneInit(struct Scene* scene) {
     } else {
         scene->checkpointState = SceneCheckpointStateSaved;
         checkpointLoadLast(scene);
+
+        // Signal materials are only updated on state change, and the loaded
+        // checkpoint could have active signals. Ensure materials accurately
+        // reflect the state of such signals, before the first scene update
+        // overwrites their previous state.
+        staticRenderCheckSignalMaterials();
     }
 
     savefileMarkChapterProgress(gCurrentLevelIndex);

src/scene/signals.c

@@ -29,7 +29,7 @@ void signalsInit(unsigned signalCount) {
 }
 
 void signalsReset() {
-    int binCount = (gSignalCount + 63) >> 6;
+    int binCount = SIGNAL_BIN_COUNT(gSignalCount);
 
     for (int i = 0; i < binCount; ++i) {
         gPrevSignals[i] = gSignals[i];