fix(board): Limit custom partition scheme to 8MB

- Limit the partition scheme from 16MB to 8MB

Author: JosipKuci

boards.txt

@@ -52966,7 +52966,7 @@ soldered_nula_deepsleep_esp32s3.menu.PartitionScheme.zigbee_zczr_8MB.build.parti
 soldered_nula_deepsleep_esp32s3.menu.PartitionScheme.zigbee_zczr_8MB.upload.maximum_size=3407872
 soldered_nula_deepsleep_esp32s3.menu.PartitionScheme.custom=Custom
 soldered_nula_deepsleep_esp32s3.menu.PartitionScheme.custom.build.partitions=
-soldered_nula_deepsleep_esp32s3.menu.PartitionScheme.custom.upload.maximum_size=16777216
+soldered_nula_deepsleep_esp32s3.menu.PartitionScheme.custom.upload.maximum_size=8388608
 
 soldered_nula_deepsleep_esp32s3.menu.CPUFreq.240=240MHz (WiFi)
 soldered_nula_deepsleep_esp32s3.menu.CPUFreq.240.build.f_cpu=240000000L