Rename Upload.js to upload.js for case-sensitive file systems

[emielmolenaar]

Fixes this on case sensitive file systems:

ERROR in ./vendor/ctf0/media-manager/src/resources/assets/js/components/manager.vue?vue&type=script&lang=js& (./node_modules/babel-loader/lib??ref--4-0!./node_modules/babel-loader/lib??ref--11-0!./node_modules/vue-loader/lib??vue-loader-options!./vendor/ctf0/media-manager/src/resources/assets/js/components/manager.vue?vue&type=script&lang=js&)
Module not found: Error: Can't resolve '../modules/upload' in './vendor/ctf0/media-manager/src/resources/assets/js/components'
 @ ./vendor/ctf0/media-manager/src/resources/assets/js/components/manager.vue?vue&type=script&lang=js& (./node_modules/babel-loader/lib??ref--4-0!./node_modules/babel-loader/lib??ref--11-0!./node_modules/vue-loader/lib??vue-loader-options!./vendor/ctf0/media-manager/src/resources/assets/js/components/manager.vue?vue&type=script&lang=js&) 22:0-39 39:203-209
 @ ./vendor/ctf0/media-manager/src/resources/assets/js/components/manager.vue?vue&type=script&lang=js&
 @ ./vendor/ctf0/media-manager/src/resources/assets/js/components/manager.vue
 @ ./vendor/ctf0/media-manager/src/resources/assets/js/manager.js
 @ ./resources/js/app.js
 @ multi ./resources/js/app.js ./resources/sass/app.scss

[ctf0]

ah yes, thanx