Add missing HD-ready (1366×768) project profiles

Yash Bavadiyarequested to merge
xevrion/kdenlive:fix/hd-ready-768p-profiles into master

Adds six HD-ready (1366×768) project profiles at standard frame rates (25, 29.97, 30, 50, 59.94, 60 fps).

Fixes #1877 (closed)

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