Fix EEPROM size of tmc_hybrid_threshold

Followup to #10102

Marlin/src/module/configuration_store.cpp

           #endif
         }
       #else
-        uint16_t thrs_val;
+        uint32_t thrs_val;
         for (uint8_t q=TMC_AXES; q--;) EEPROM_READ(thrs_val);
       #endif