Take new screenshots for appdata file
The current ones are outdated and fail the appstream validation for not having the expected 16:9 aspect ratio.
builddir/files/share/appdata/org.gnome.SoundRecorder.appdata.xml: FAILED:
• style-invalid : <image> has vertical padding [https://git.gnome.org/browse/gnome-sound-recorder/plain/data/appdata/gsr-main.png]
• style-invalid : <image> has horizontal padding [https://git.gnome.org/browse/gnome-sound-recorder/plain/data/appdata/gsr-main.png]
• aspect-ratio-invalid : <screenshot> aspect ratio not 16:9 [https://git.gnome.org/browse/gnome-sound-recorder/plain/data/appdata/gsr-main.png]
• aspect-ratio-invalid : <screenshot> aspect ratio not 16:9 [https://git.gnome.org/browse/gnome-sound-recorder/plain/data/appdata/gsr-preferences.png]
Validation of files failed