Followup to progress override (#15488)

Marlin/src/lcd/extensible_ui/lib/dgus/DGUSDisplayDefinition.cpp

   VPHELPER(VP_ZPos, &current_position.z, nullptr, DGUSScreenVariableHandler::DGUSLCD_SendFloatAsLongValueToDisplay<2>),
 
   // Print Progress.
-  VPHELPER(VP_PrintProgress_Percentage, &ui.progress_bar_percent, nullptr, DGUSScreenVariableHandler::DGUSLCD_SendWordValueToDisplay ),
+  VPHELPER(VP_PrintProgress_Percentage, &ui.progress_override, nullptr, DGUSScreenVariableHandler::DGUSLCD_SendWordValueToDisplay ),
 
   // Print Time
   VPHELPER_STR(VP_PrintTime, nullptr, VP_PrintTime_LEN, nullptr, DGUSScreenVariableHandler::DGUSLCD_SendPrintTimeToDisplay ),

Marlin/src/lcd/ultralcd.cpp

 #endif
 
 #if ENABLED(LCD_SET_PROGRESS_MANUALLY)
-  uint8_t MarlinUI::progress_bar_percent; // = 0
+  uint8_t MarlinUI::progress_override; // = 0
 #endif
 
 #if HAS_BUZZER
   #if HAS_PRINT_PROGRESS
     uint8_t MarlinUI::get_progress() {
       #if ENABLED(LCD_SET_PROGRESS_MANUALLY)
-        uint8_t &progress = progress_bar_percent;
-        #define _PLIMIT(P) ((P) & 0x7F)
+        const uint8_t p = progress_override & 0x7F;
       #else
-        #define _PLIMIT(P) P
-        uint8_t progress = 0;
+        constexpr uint8_t p = 0;
       #endif
-      #if ENABLED(SDSUPPORT)
-        if (!_PLIMIT(progress)) progress = card.percentDone();
-      #endif
-      return _PLIMIT(progress);
+      return (p
+        #if ENABLED(SDSUPPORT)
+          ?: card.percentDone()
+        #endif
+      );
     }
   #endif
 

Marlin/src/lcd/ultralcd.h

 
     #if HAS_PRINT_PROGRESS
       #if ENABLED(LCD_SET_PROGRESS_MANUALLY)
-        static uint8_t progress_bar_percent;
-        static void set_progress(const uint8_t progress) { progress_bar_percent = _MIN(progress, 100); }
+        static uint8_t progress_override;
+        static void set_progress(const uint8_t progress) { progress_override = _MIN(progress, 100); }
         static void set_progress_done() { set_progress(0x80 + 100); }
-        static void progress_reset() { if (progress_bar_percent & 0x80) set_progress(0); }
+        static void progress_reset() { if (progress_override & 0x80) set_progress(0); }
       #endif
       static uint8_t get_progress();
     #else