When a user adds a file through drag and drop, it creates a draft review

request, as expected. However, when a user adds a file through the menu 

option Update > Add File, there is no draft review request created.
This bug fix addresses this issue by removing the window reload when the

user uploads a file and uses reviewRequestEditor.createFileAttachment 

instead of reviewRequest.createFileAttachment to create a draft review 

and closing the "Add File" dialog manually.

Ran JS tests (all of which pass).
Tested behaviour in Chrome and Firefox by first running through the 

following steps with the drag-and-drop file upload (which was 

expected to work, as a baseline) and then running through the steps 

again by uploading a file with the Update > Add File option:

Open an already published review request.
In the console, run the following commands:

RB.PageManager.getPage().reviewRequest.draft.id (expected & observed 

output: undefined)

RB.PageManager.getPage().model.reviewRequestEditor.get('hasDraft') 

(expected & observed output: false)
Upload file (with drag-and-drop or Update > Add File method)
Observe the file attachment in the Files section of the review 

request and the appearance of the draft review banner. Run the commands 

again:

RB.PageManager.getPage().reviewRequest.draft.id (expected & observed 

output: defined (some id))

RB.PageManager.getPage().model.reviewRequestEditor.get('hasDraft') 

(expected output: true)