qemuxml2argvtest: Fix test after change of qxl vgamem_mb default

Well, apparently it's possible for a patch to sneak in through
review process and break 'make check'. It happened just lately
with 0e502466 which changed the default of vgamem_mb for
qxl device. However, there were left some domain XMLs within our
test suite relying on the old default. These should be updated to
match the change.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

tests/qemuxml2argvdata/qemuxml2argv-video-qxl-device-vgamem.args

@@ -2,5 +2,5 @@ LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
 /usr/bin/qemu -S -M pc -m 1024 -smp 1 -nographic -nodefaults \
 -monitor unix:/tmp/test-monitor,server,nowait -no-acpi -boot c -usb \
 -hda /var/lib/libvirt/images/QEMUGuest1 \
--device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vgamem_mb=8\
+-device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vgamem_mb=16\
 ,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3

tests/qemuxml2argvdata/qemuxml2argv-video-qxl-sec-device-vgamem.args

@@ -2,7 +2,7 @@ LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
 /usr/bin/qemu -S -M pc -m 1024 -smp 1 -nographic -nodefaults \
 -monitor unix:/tmp/test-monitor,server,nowait -no-acpi -boot c -usb \
 -hda /var/lib/libvirt/images/QEMUGuest1 \
--device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vgamem_mb=8\
+-device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vgamem_mb=16\
 ,bus=pci.0,addr=0x2 -device qxl,id=video1,ram_size=67108864,vram_size=67108864\
-,vgamem_mb=8,bus=pci.0,addr=0x4 \
+,vgamem_mb=16,bus=pci.0,addr=0x4 \
 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3