Bug 1885949 - Do not copy over HTTPS-First upgrade flag into new loadinfo a=dmeehan

dom/base/Document.cpp

dom/security/nsHTTPSOnlyUtils.cpp

dom/security/nsHTTPSOnlyUtils.h

dom/security/test/https-first/browser.ini

...ecurity/test/https-first/browser_subdocument_downgrade.js

dom/security/test/https-first/file_empty.html

dom/security/test/https-first/file_subdocument_downgrade.sjs

netwerk/base/LoadInfo.cpp