mozillaLoadFile does not close input streams

[XavierVerges]

It probably does not have any adverse effects, but mozillaLoadFile() should close the streams that it has openeded before returning the contents. It is a matter of changing  http://trac.tiddlywiki.org/browser/Trunk/core/js/FileSystem.js#L235

return sInputStream.read(sInputStream.available());

for

var contents = sInputStream.read(sInputStream.available());
sInputStream.close();
inputStream.close();
return contents;

[FND]

patch as per XavierVerges?' instructions

[JeremyRuston]

Fixed in changeset:3532