Fix uploading attachments.

Thanks to BabyFnord and xet7 !

Related #4585

.meteor/packages

@@ -80,7 +80,7 @@ konecty:mongo-counter
 percolate:synced-cron
 cfs:filesystem
 ostrio:cookies
-ostrio:files@2.0.1
+ostrio:files@2.0.1!
 rajit:bootstrap3-datepicker-fi
 rajit:bootstrap3-datepicker-ar
 rajit:bootstrap3-datepicker-bg

.meteor/versions

@@ -125,7 +125,7 @@ ongoworks:speakingurl@1.1.0
 ordered-dict@1.1.0
 ostrio:cookies@2.7.2
 ostrio:cstorage@4.0.1
-ostrio:files@2.2.1
+ostrio:files@2.0.1
 ostrio:i18n@3.2.0
 pascoual:pdfkit@1.0.7
 peerlibrary:assert@0.3.0