Fix default disk type when parsing QEMU argv

* src/qemu/qemu_conf.c: Fix default disk type to be 'FILE'
  again, after previous commit accidentally changed it

src/qemu/qemu_conf.c

@@ -2778,6 +2778,7 @@ qemuParseCommandLineDisk(virConnectPtr conn,
 
     def->bus = VIR_DOMAIN_DISK_BUS_IDE;
     def->device = VIR_DOMAIN_DISK_DEVICE_DISK;
+    def->type = VIR_DOMAIN_DISK_TYPE_FILE;
 
     for (i = 0 ; i < nkeywords ; i++) {
         if (STREQ(keywords[i], "file")) {