Revert SPIFFS_USE_MAGIC_LENGTH to 0 (#3612)
Revert SPIFFS_USE_MAGIC_LENGTH to 0 (#3612)

me-no-dev/Arduino,wemos/Arduino,sticilface/Arduino,jes/Arduino,Lan-Hekary/Arduino,Adam5Wu/Arduino,sticilface/Arduino,esp8266/Arduino,Adam5Wu/Arduino,lrmoreno007/Arduino,esp8266/Arduino,lrmoreno007/Arduino,Juppit/Arduino,Lan-Hekary/Arduino,esp8266/Arduino,hallard/Arduino,Adam5Wu/Arduino,sticilface/Arduino,wemos/Arduino,wemos/Arduino,me-no-dev/Arduino,Lan-Hekary/Arduino,Lan-Hekary/Arduino,Juppit/Arduino,jes/Arduino,hallard/Arduino,jes/Arduino,jes/Arduino,esp8266/Arduino,lrmoreno007/Arduino,wemos/Arduino,Juppit/Arduino,Adam5Wu/Arduino,jes/Arduino,hallard/Arduino,esp8266/Arduino,me-no-dev/Arduino,Juppit/Arduino,hallard/Arduino,me-no-dev/Arduino,sticilface/Arduino,wemos/Arduino,me-no-dev/Arduino,lrmoreno007/Arduino,Juppit/Arduino,Lan-Hekary/Arduino,hallard/Arduino,sticilface/Arduino,lrmoreno007/Arduino,Adam5Wu/Arduino