Bump thumbnail JPEG quality from 80 to 85

80 was a bit too low. 85 might still be too low, we'll have to see.

internal/manager/last_rendered/last_rendered.go

@@ -21,7 +21,7 @@ const (
 	// new requests to process.
 	queueSize = 3
 
-	thumbnailJPEGQuality = 80
+	thumbnailJPEGQuality = 85
 )
 
 var (

internal/worker/output_uploader.go

@@ -17,7 +17,7 @@ import (
 	"git.blender.org/flamenco/pkg/last_in_one_out_queue"
 )
 
-const thumbnailJPEGQuality = 80
+const thumbnailJPEGQuality = 85
 
 // OutputUploader sends (downscaled versions of) rendered images to Flamenco
 // Manager. Only one image is sent at a time. A queue of a single image is kept,