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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[github-actions]

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Some issues found for the commit messages in this PR: the commit message "Update HTTPUpdateServer.h": summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 10 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

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