Group some sanity checks

Marlin/src/HAL/LPC1768/inc/SanityCheck.h

 
 #if ENABLED(SERIAL_STATS_MAX_RX_QUEUED)
   #error "SERIAL_STATS_MAX_RX_QUEUED is not supported on this platform."
-#endif
-
-#if ENABLED(SERIAL_STATS_DROPPED_RX)
+#elif ENABLED(SERIAL_STATS_DROPPED_RX)
   #error "SERIAL_STATS_DROPPED_RX is not supported on this platform."
-#endif  
+#endif

Marlin/src/HAL/STM32/inc/SanityCheck.h

 
 #if ENABLED(SERIAL_STATS_MAX_RX_QUEUED)
   #error "SERIAL_STATS_MAX_RX_QUEUED is not supported on this platform."
-#endif
-
-#if ENABLED(SERIAL_STATS_DROPPED_RX)
+#elif ENABLED(SERIAL_STATS_DROPPED_RX)
   #error "SERIAL_STATS_DROPPED_RX is not supported on this platform."
-#endif  
+#endif

Marlin/src/HAL/STM32F1/inc/SanityCheck.h

 
 #if ENABLED(SERIAL_STATS_MAX_RX_QUEUED)
   #error "SERIAL_STATS_MAX_RX_QUEUED is not supported on this platform."
-#endif
-
-#if ENABLED(SERIAL_STATS_DROPPED_RX)
+#elif ENABLED(SERIAL_STATS_DROPPED_RX)
   #error "SERIAL_STATS_DROPPED_RX is not supported on this platform."
-#endif  
+#endif

Marlin/src/lcd/dogm/dogm_Statusscreen.h

       #endif
       #ifndef STATUS_HOTEND8_TEXT_X
         #define STATUS_HOTEND8_TEXT_X STATUS_HOTEND7_TEXT_X + STATUS_HEATERS_XSPACE
-      #endif      
+      #endif
       constexpr uint8_t status_hotend_text_x[] = ARRAY_N(HOTENDS, STATUS_HOTEND1_TEXT_X, STATUS_HOTEND2_TEXT_X, STATUS_HOTEND3_TEXT_X, STATUS_HOTEND4_TEXT_X, STATUS_HOTEND5_TEXT_X, STATUS_HOTEND6_TEXT_X, STATUS_HOTEND7_TEXT_X, STATUS_HOTEND8_TEXT_X);
       #define STATUS_HOTEND_TEXT_X(N) status_hotend_text_x[N]
     #else