hmi-audio-combined: Improve Pre-conditions of the test

Actually, installing Flatpak Apps is not really part of the test,
but more a pre-condition of the test.

Moreover, the Apertis repository and org.apertis.hmi.totem
are not installed by default on SDK images.

Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

test-cases/hmi-audio-combined.yaml

@@ -22,14 +22,18 @@ metadata:
     - $ pactl set-sink-port alsa_output.platform-sound.stereo-fallback analog-output-headphones
     - "After reboot ensure that headphones will not be muted:"
     - $ pactl set-sink-mute alsa_output.platform-sound.stereo-fallback false
+    - "Add the Flathub repository (only needed on SDK images)"
+    - $ flatpak remote-add --user --no-sign-verify --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
+    - "Install Rhythmbox from Flathub (only needed on SDK images)"
+    - $ flatpak install --user flathub org.gnome.Rhythmbox3
+    - "Add the Apertis repository (only needed on SDK images)"
+    - $ sudo flatpak remote-add apertis https://images.apertis.org/flatpak/repo/apertis.flatpakrepo
+    - "Install Videos Application from Apertis (only needed on SDK images)"
+    - $ sudo flatpak install apertis org.apertis.hmi.totem
   expected:
     - "Audio files play without any glitch and can be paused"
 run:
  steps:
-   - "Add the Flathub repository (only needed on SDK images)"
-   - $ flatpak remote-add --user --no-sign-verify --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
-   - "Install Rhythmbox from Flathub (only needed on SDK images)"
-   - $ flatpak install --user flathub org.gnome.Rhythmbox3
    - "Open the Rhythmbox Music Application"
    - $ flatpak run org.gnome.Rhythmbox3
    - "Play and Pause any song"