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

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

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