Temporarily disable file validation, because it prevents migrating some attachments at wekan/server/migrations.js to ostrio Meteor-Files.

Thanks to xet7 !

Related #4780,
related https://github.com/wekan/wekan/pull/4648

models/fileValidation.js

@@ -13,6 +13,7 @@ if (Meteor.isServer) {
 export async function isFileValid(fileObj, mimeTypesAllowed, sizeAllowed, externalCommandLine) {
   let isValid = true;
 
+/*
   if (mimeTypesAllowed.length) {
     const mimeTypeResult = await FileType.fromFile(fileObj.path);
 
@@ -43,6 +44,7 @@ export async function isFileValid(fileObj, mimeTypesAllowed, sizeAllowed, extern
   if (isValid) {
     console.debug("Validation of uploaded file successful: file " + fileObj.path);
   }
+*/
 
   return isValid;
 }