Remove deprecated global variables

apps/files/js/file-upload.js

apps/files/js/filelist.js

core/js/dist/login.js

core/js/dist/login.js.map

core/js/dist/main.js

core/js/dist/main.js.map

core/js/dist/maintenance.js

core/js/dist/maintenance.js.map

core/js/dist/recommendedapps.js

core/js/dist/recommendedapps.js.map

core/src/OC/dialogs.js

core/src/OC/util.js

core/src/Util/format-date.js

core/src/Util/relative-modified-date.js

core/src/globals.js