Refresh the mounts at each scan operation.

Jeremy Whiting requested to merge work/whiting/refreshMountsEveryScan into master

Without this if you start filelight, then mount a volume, then start a scan, it will scan the new volume even if config is only set to scan local files...

Found this by hitting it after mounting a large nfs file share. Scan kept going after passing the 1.5TB of locally used files. With this it stops at that point and shows only local files as wanted.

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