tests: drop redundant virQEMUCapsFilterByMachineType

Introduced by commit <af204232>.

Made redundant by commit 1e9a0837 which switched to using
qemuProcessCreatePretendCmd, where capabilities are filtered
in qemuProcessInit after being fetched from the cache.
Signed-off-by: NJán Tomko <jtomko@redhat.com>

tests/qemuxml2argvtest.c

@@ -425,8 +425,6 @@ testUpdateQEMUCaps(const struct testInfo *info,
     virQEMUCapsInitHostCPUModel(info->qemuCaps, caps->host.arch,
                                 VIR_DOMAIN_VIRT_QEMU);
 
-    virQEMUCapsFilterByMachineType(info->qemuCaps, vm->def->os.machine);
-
     ret = 0;
 
  cleanup: