qemu: snapshot: Resume VM after live snapshot

Commit 4b951d1e missed the fact that the
VM needs to be resumed after a live external checkpoint (memory
snapshot) where the cpus would be paused by the migration rather than
libvirt.

src/qemu/qemu_driver.c

@@ -14503,6 +14503,9 @@ qemuDomainSnapshotCreateActiveExternal(virConnectPtr conn,
          * atomic flag now says whether we need to pause, and a
          * capability bit says whether to use transaction.
          */
+        if (memory)
+            resume = true;
+
         if ((memory && !(flags & VIR_DOMAIN_SNAPSHOT_CREATE_LIVE)) ||
             (!memory && atomic && !transaction)) {
             if (qemuProcessStopCPUs(driver, vm, VIR_DOMAIN_PAUSED_SNAPSHOT,