<fix>[vm]: change 'ture' to 'yes' for uefi secure opt

Resolves: ZSTAC-47508

Change-Id: I6c716e6d72656970726b736a6e6c6b76656b6274
Signed-off-by: AlanJager <ye.zou@zstack.io>

Author: AlanJager

kvmagent/kvmagent/plugins/vm_plugin.py

@@ -3756,7 +3756,7 @@ def on_x86_64():
                 # if boot mode is UEFI
                 if cmd.bootMode == "UEFI" or cmd.bootMode == "UEFI_WITH_CSM":
                     if cmd.secureBoot:
-                        e(os, 'loader', '/usr/share/edk2/ovmf/OVMF_CODE.secboot.fd', attrib={'readonly': 'yes', 'secure': 'true', 'type': 'pflash'})
+                        e(os, 'loader', '/usr/share/edk2/ovmf/OVMF_CODE.secboot.fd', attrib={'readonly': 'yes', 'secure': 'yes', 'type': 'pflash'})
                         e(os, 'nvram', '/var/lib/libvirt/qemu/nvram/%s.fd' % cmd.vmInstanceUuid, attrib={'template': '/usr/share/edk2/ovmf/OVMF_VARS.secboot.fd'})
                     else:
                         e(os, 'loader', '/usr/share/edk2/ovmf/OVMF_CODE.cc.fd', attrib={'readonly': 'yes', 'type': 'pflash'})