Merge pull request #13985 from tpruvot/stm32_sdeeprom

STM32F1: fix sdcard filename conversion

Marlin/src/HAL/HAL_STM32F1/persistent_store_sdcard.cpp

 
   #include "../../sd/cardreader.h"
 
-  static const char eeprom_filename[] = "eeprom.dat";
+  static char eeprom_filename[] = "eeprom.dat";
 
   bool PersistentStore::access_start() {
     if (!card.isDetected()) return false;