Apply TERN to compact code (#17619)

Marlin/src/libs/L64XX/L64XX_Marlin.cpp

@@ -923,9 +923,7 @@ void L64XX_Marlin::say_axis(const L64XX_axis_t axis, const uint8_t label/*=true*
           monitor_update(E5);
         #endif
 
-        #if ENABLED(L6470_DEBUG)
-          if (report_L6470_status) DEBUG_EOL();
-        #endif
+        if (TERN0(L6470_DEBUG, report_L6470_status)) DEBUG_EOL();
 
         spi_active = false;   // done with all SPI transfers - clear handshake flags
         spi_abort = false;