app: Fix Gst.init parameters

Tobias Mueller requested to merge gh-a1d2d6d2/14/RyuzakiKK/gst_fix into master

Created by: RyuzakiKK

Gst.init() requires a [str] or None as parameters. On ArchLinux with the package gst-python that is "GStreamer Python binding overrides (complementing the bindings provided by python-gi)", leaving init() without parameters causes a runtime error. Adding None as parameter it will works with gst-python and also without it.

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