Fix FreeRDP H.264 streaming

[twelho]

Without ffmpeg-full, RDP connections (with no extra arguments) won't start:

$ QT_LOGGING_RULES="KRDC.debug=true" flatpak run org.kde.krdc
...
KRDC: "[17:42:53:281] [17:17] [ERROR][com.freerdp.codec] - Failed to initialize libav parser\n"
KRDC: "[17:42:53:282] [17:17] [ERROR][com.freerdp.core.codecs] - Failed to create h264 codec context\n"
KRDC: "[17:42:53:283] [17:17] [ERROR][com.freerdp.client.wayland] - Failed to connect\n"

[travier]

Changes look good but it needs to be in JSON right now.

[flathubbot]

Started test build 70803

[flathubbot]

Build 70803 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/53457/org.kde.krdc.flatpakref

[twelho]

Changes look good but it needs to be in JSON right now.

Alright, changes ported to JSON.

[flathubbot]

Started test build 70879

[flathubbot]

Build 70879 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/53532/org.kde.krdc.flatpakref

[flathubbot]

Started test build 70962

[flathubbot]

Build 70962 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/53618/org.kde.krdc.flatpakref