qemuxml2argvdata: Drop useless spaces at the beginning of lines

There are three test XMLs that have useless spaces at the
beginning of each line. I intend to add these to qemuxml2xmltest
and make xmlout a symlink to the original XML. In order to do
that the XMLs must look better than they do now.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

tests/qemuxml2argvdata/fd-memory-numa-topology2.xml

-  <domain type='kvm' id='56'>
+<domain type='kvm' id='56'>
   <name>instance-00000092</name>
   <uuid>126f2720-6f8e-45ab-a886-ec9277079a67</uuid>
   <memory unit='KiB'>14680064</memory>
@@ -28,4 +28,4 @@
     <emulator>/usr/bin/qemu-system-x86_64</emulator>
     <memballoon model='virtio'/>
   </devices>
-  </domain>
+</domain>

tests/qemuxml2argvdata/fd-memory-numa-topology3.xml

-  <domain type='kvm' id='56'>
+<domain type='kvm' id='56'>
   <name>instance-00000092</name>
   <uuid>126f2720-6f8e-45ab-a886-ec9277079a67</uuid>
   <memory unit='KiB'>14680064</memory>
@@ -29,4 +29,4 @@
     <emulator>/usr/bin/qemu-system-x86_64</emulator>
     <memballoon model='virtio'/>
   </devices>
-  </domain>
+</domain>

tests/qemuxml2argvdata/memfd-memory-numa.xml

-  <domain type='kvm' id='56'>
+<domain type='kvm' id='56'>
   <name>instance-00000092</name>
   <uuid>126f2720-6f8e-45ab-a886-ec9277079a67</uuid>
   <memory unit='KiB'>14680064</memory>
@@ -33,4 +33,4 @@
     <emulator>/usr/bin/qemu-system-x86_64</emulator>
     <memballoon model='virtio'/>
   </devices>
-  </domain>
+</domain>