Fix screen not sleeping due to power status updates (#9216)

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/graphics/Screen.cpp

@@ -1429,10 +1429,15 @@ int Screen::handleStatusUpdate(const meshtastic::Status *arg)
         }
         nodeDB->updateGUI = false;
         break;
-    case STATUS_TYPE_POWER:
+    case STATUS_TYPE_POWER: {
-        forceDisplay(true);
+        bool currentUSB = powerStatus->getHasUSB();
+        if (currentUSB != lastPowerUSBState) {
+            lastPowerUSBState = currentUSB;
+            forceDisplay(true);
+        }
         break;
     }
+    }
 
     return 0;
 }

src/graphics/Screen.h

@@ -715,6 +715,8 @@ class Screen : public concurrency::OSThread
     // Whether we are showing the regular screen (as opposed to booth screen or
     // Bluetooth PIN screen)
     bool showingNormalScreen = false;
+    /// Track USB power state to only wake screen on actual power state changes
+    bool lastPowerUSBState = false;
 
     // Implementation to Adjust Brightness
     uint8_t brightness = BRIGHTNESS_DEFAULT; // H = 254, MH = 192, ML = 130 L = 103