Fix multi-page write calculation for how many bytes need to be written on each page.

When pageNumber2 is not the next page the calculation returns a value higher than the page size.
Instead, use pageNumber1 end and substract the number of bytes already written to that page.

Author: romain145

src/SparkFun_External_EEPROM.cpp

@@ -209,7 +209,7 @@ void ExternalEEPROM::write(uint32_t eepromLocation, const uint8_t *dataToWrite,
       uint16_t pageNumber1 = (eepromLocation + recorded) / settings.pageSize_bytes;
       uint16_t pageNumber2 = (eepromLocation + recorded + amtToWrite - 1) / settings.pageSize_bytes;
       if (pageNumber2 > pageNumber1)
-        amtToWrite = (pageNumber2 * settings.pageSize_bytes) - (eepromLocation + recorded); //Limit the read amt to go right up to edge of page barrier
+        amtToWrite = ((pageNumber1+1) * settings.pageSize_bytes) - (eepromLocation + recorded); //Limit the write amt to go right up to edge of page barrier
     }
 
     uint8_t i2cAddress = settings.deviceAddress;