🐛 Fix anycubic_i3mega_lcd debug macros (#22820)

Marlin/src/lcd/extui/anycubic_i3mega/anycubic_i3mega_lcd.cpp

@@ -38,8 +38,8 @@
 #define SEND(x)           send(x)
 #define SENDLINE(x)       sendLine(x)
 #if ENABLED(ANYCUBIC_LCD_DEBUG)
-  #define SENDLINE_DBG_PGM(x,y)       (sendLine_P(PSTR(x)), SERIAL_ECHOLNPGM(y))
-  #define SENDLINE_DBG_PGM_VAL(x,y,z) (sendLine_P(PSTR(x)), SERIAL_ECHOPGM(y), SERIAL_ECHOLN(z))
+  #define SENDLINE_DBG_PGM(x,y)       do{ sendLine_P(PSTR(x)); SERIAL_ECHOLNPGM(y); }while(0)
+  #define SENDLINE_DBG_PGM_VAL(x,y,z) do{ sendLine_P(PSTR(x)); SERIAL_ECHOLNPGM(y, z); }while(0)
 #else
   #define SENDLINE_DBG_PGM(x,y)       sendLine_P(PSTR(x))
   #define SENDLINE_DBG_PGM_VAL(x,y,z) sendLine_P(PSTR(x))