Fix bad entry of sources list for Peppermint OS 5

Just quick post for myself. Today I need to give sample to my student about apt-get command and while I try it I got this error : Err http://ppa.launchpad.net trusty/main amd64 Packages 404 Not Found Err http://ppa.launchpad.net trusty/main i386 Packages 404 Not Found W: Failed to fetch http://ppa.launchpad.net/openshot.developers/ppa/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found W: Failed to fetch …

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