File sort by date and thumbnails

[mpalm0508]

Describe the bug
I am running a local build from merge cb70bc4. When files are sorted by date month is reversed. For instance a file from February 20th shows in the list before a file from March 10 when being sorted by descending. If you sort by Ascending it is the exact reverse. I can get correct sort by modifying line 59 in files.octoprint.services.ts to the following. However I do not know what all affect that has.

date: this.conversionService.convertDateToString(new Date(fileOrFolder.date * 1)),

The second issue is while printing files with thumbnails the thumbnail is of the next file in the list. So If I print file "A" the thumbnail for file "B" is shown.

I know there were a lot of changes to get websockets running. I just wanted to bring up a couple bugs I have found.

Mike

[UnchartedBull]

Thanks for this! Your fix does seem to work and I didn't saw anything that got broken with it :)