tests: qemuxml2argv: Remove unused data for 'serial-pty'

The last use was removed in 7b604379 when we deleted the old
commandline parser. The same functionality is tested by
'serial-pty-chardev'.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

tests/qemuxml2argvdata/serial-pty.args

-LC_ALL=C \
-PATH=/bin \
-HOME=/home/test \
-USER=test \
-LOGNAME=test \
-QEMU_AUDIO_DRV=none \
-/usr/bin/qemu-system-i686 \
--name QEMUGuest1 \
--S \
--M pc \
--m 214 \
--smp 1,sockets=1,cores=1,threads=1 \
--uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
--nographic \
--nodefaults \
--chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest1/monitor.sock,\
-server,nowait \
--mon chardev=charmonitor,id=monitor,mode=readline \
--no-acpi \
--boot c \
--usb \
--drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-ide0-0-0 \
--device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
--serial pty

tests/qemuxml2argvdata/serial-pty.xml

-<domain type='qemu'>
-  <name>QEMUGuest1</name>
-  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
-  <memory unit='KiB'>219136</memory>
-  <currentMemory unit='KiB'>219136</currentMemory>
-  <vcpu placement='static'>1</vcpu>
-  <os>
-    <type arch='i686' machine='pc'>hvm</type>
-    <boot dev='hd'/>
-  </os>
-  <clock offset='utc'/>
-  <on_poweroff>destroy</on_poweroff>
-  <on_reboot>restart</on_reboot>
-  <on_crash>destroy</on_crash>
-  <devices>
-    <emulator>/usr/bin/qemu-system-i686</emulator>
-    <disk type='block' device='disk'>
-      <driver name='qemu' type='raw'/>
-      <source dev='/dev/HostVG/QEMUGuest1'/>
-      <target dev='hda' bus='ide'/>
-      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
-    </disk>
-    <controller type='usb' index='0'/>
-    <controller type='ide' index='0'/>
-    <controller type='pci' index='0' model='pci-root'/>
-    <serial type='pty'>
-      <target port='0'/>
-    </serial>
-    <console type='pty'>
-      <target type='serial' port='0'/>
-    </console>
-    <input type='mouse' bus='ps2'/>
-    <input type='keyboard' bus='ps2'/>
-    <memballoon model='none'/>
-  </devices>
-</domain>