Thumbs.db files should not be in ZIM files (static directory)

[kelson42]

In dl-static we have a few Thumbs.db files (created by windows file explorer). This files should not be copied to the static directory.

dl-cache/37293_Thumbs.db dl-cache/10912_Thumbs.db dl-cache/22189_Thumbs.db dl-cache/16275_Thumbs.db dl-cache/14472_Thumbs.db dl-cache/26998_Thumbs.db dl-cache/11496_Thumbs.db dl-cache/31242_Thumbs.db dl-cache/37149_Thumbs.db dl-cache/37243_Thumbs.db dl-cache/10862_Thumbs.db dl-cache/7005_Thumbs.db dl-cache/37185_Thumbs.db dl-cache/10796_Thumbs.db dl-cache/10014_Thumbs.db dl-cache/11171_Thumbs.db dl-cache/19149_Thumbs.db dl-cache/33269_Thumbs.db dl-cache/37156_Thumbs.db dl-cache/10015_Thumbs.db dl-cache/12536_Thumbs.db dl-cache/37063_Thumbs.db dl-cache/30526_Thumbs.db dl-cache/32988_Thumbs.db dl-cache/16499_Thumbs.db dl-cache/10013_Thumbs.db dl-cache/10008_Thumbs.db dl-cache/33225_Thumbs.db dl-cache/12848_Thumbs.db dl-cache/18153_Thumbs.db dl-cache/33205_Thumbs.db dl-cache/37164_Thumbs.db dl-cache/13549_Thumbs.db dl-cache/10830_Thumbs.db dl-cache/31168_Thumbs.db dl-cache/37398_Thumbs.db dl-cache/32397_Thumbs.db dl-cache/6961_Thumbs.db dl-cache/10018_Thumbs.db dl-cache/36891_Thumbs.db dl-cache/12278_Thumbs.db