qemu: process: Allow VIR_QEMU_PROCESS_START_NEW in qemuProcessLaunch

The new flag was not added to virCheckFlags in commit '0d1c17aa' causing
a regression where VMs were not able to start.

src/qemu/qemu_process.c

@@ -5062,7 +5062,8 @@ qemuProcessLaunch(virConnectPtr conn,
      * but doesn't hurt to check */
     virCheckFlags(VIR_QEMU_PROCESS_START_COLD |
                   VIR_QEMU_PROCESS_START_PAUSED |
-                  VIR_QEMU_PROCESS_START_AUTODESTROY, -1);
+                  VIR_QEMU_PROCESS_START_AUTODESTROY |
+                  VIR_QEMU_PROCESS_START_NEW, -1);
 
     cfg = virQEMUDriverGetConfig(driver);