Fix Partition Calculation for min SPIFFS (espressif#2072)

I have kept the original APPS size on purpose as 40KB SPIFFS is useless IMHO

Author: Luc

tools/partitions/min_spiffs.csv

@@ -3,5 +3,5 @@ nvs,      data, nvs,     0x9000,  0x5000,
 otadata,  data, ota,     0xe000,  0x2000,
 app0,     app,  ota_0,   0x10000, 0x1E0000,
 app1,     app,  ota_1,   0x1F0000,0x1E0000,
-eeprom,   data, 0x99,    0x3F0000,0x1000,
-spiffs,   data, spiffs,  0x3F1000,0xF000,
+eeprom,   data, 0x99,    0x3D0000,0x1000,
+spiffs,   data, spiffs,  0x3D1000,0x2F000,