Fix file size report after build (#5333)

Created by: OskarPersson

Fixes #5333 (closed)

printFileSizesAfterBuild calls canReadAsset with an object containing the file name while measureFileSizesBeforeBuild calls it with just the name. When canReadAsset only receives the name it returns false since accessing the name property results in undefined.

This PR fixes that by having canReadAssset instead expect only the file name and making printFileSizesAfterBuild just like measureFileSizesBeforeBuild only provide the name as argument.