Rename power.h to Power.h for casing consistency with Power.cpp (#10919)

Every other .cpp/.h pair in src/ (350 of 351) uses identical
capitalization between the two files. Power.cpp/power.h was the sole
outlier; this aligns it with the rest of the codebase. No functional
change — all includes already resolved this file the same way on
case-sensitive filesystems.

Assisted-by: Claude Sonnet 5 <noreply@anthropic.com>

Signed-off-by: Andrew Yong <me@ndoo.sg>
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/motion/MotionSensor.h

@@ -9,11 +9,11 @@
 
 #if !defined(ARCH_STM32WL) && !MESHTASTIC_EXCLUDE_I2C
 
+#include "../Power.h"
 #include "../PowerFSM.h"
 #include "../detect/ScanI2C.h"
 #include "../graphics/Screen.h"
 #include "../graphics/ScreenFonts.h"
-#include "../power.h"
 #include "Wire.h"
 
 // Base class for motion processing