arch/esp32_partition.c: fix the issue of switching from Factory to OTA_1

with a fixed seq of 1, which causes ota_get_bootseq() to return ota_0.

The current solution is to directly use the target partition's number (num)
as next_seq to ensure the correct increment logic of seq. Ensure the formula
(seq-1) % OTA_DATA_NUM + OTA_IMG_BOOT_OTA_0 correctly maps to ota_0 or ota_1

Signed-off-by: nuttxs <zhaoqing.zhang@sony.com>

arch/xtensa/src/esp32/esp32_partition.c

@@ -333,7 +333,7 @@ static int ota_set_bootseq(struct mtd_dev_priv *dev, int num)
           }
         else if (ret == OTA_IMG_BOOT_FACTORY)
           {
-            next_seq = 1;
+            next_seq = (uint32_t)num;
           }
         else
           {