Update HTTPUpdateServer.h to Fix SPIFFS Update error: Bad Size Given

[kapyaar]

if (!Update.begin(SPIFFS.totalBytes(), U_SPIFFS)) {

throws an error "Update error: Bad Size Given". Changing to

if (!Update.begin(UPDATE_SIZE_UNKNOWN, U_SPIFFS)) {

fixes #9967. Submitting a PR as per #9967 (comment)

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[Jason2866]

@me-no-dev is it planned to replace the dead horse spiffs with LittleFS in HTTPUpdateServer?

[me-no-dev]

Actually here the size of the FS partition should be read and used. Code can be abstracted to flash any FS type, instead of just SPIFFS

[kapyaar]

If there is a better approach to handle this, Please update or let me know, I can do another PR. One way or the other, It would be great to get this fixed, as at this point, with each release (for backward compatibility), a manual update of this file is the only way out.