sharefile: fix backend due to API swapping integers for strings

For some reason the API started returning some integers as strings in
JSON. This is probably OK in Javascript but it upsets Go.

This is easily fixed with the `json:"name,size"` struct tag.

backend/sharefile/api/types.go

@@ -106,7 +106,7 @@ type UploadSpecification struct {
 type UploadFinishResponse struct {
 	Error        bool   `json:"error"`
 	ErrorMessage string `json:"errorMessage"`
-	ErrorCode    int    `json:"errorCode"`
+	ErrorCode    int    `json:"errorCode,string"`
 	Value        []struct {
 		UploadID    string `json:"uploadid"`
 		ParentID    string `json:"parentid"`
@@ -114,7 +114,7 @@ type UploadFinishResponse struct {
 		StreamID    string `json:"streamid"`
 		FileName    string `json:"filename"`
 		DisplayName string `json:"displayname"`
-		Size        int    `json:"size"`
+		Size        int    `json:"size,string"`
 		Md5         string `json:"md5"`
 	} `json:"value"`
 }