PBM-1058: fix phys backups on datadirs with tailing / #802
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Phys backup while trimming datadir from the file path always added a slash to the trim prefix. In case datadir was set with a tailing slash it led to a double slash and datadir wasn't trimmed at all (
Trimprefix("/data/db/file1", "/data/db//")
). Therefore in the backup's meta such files contain datadir and the restore would put them in a subdirectory inside datadir, "/data/db/data/db/file1" instead of "/data/db/file1".This change fixes it.