qemu: command: Optimize formatting of 'passwordid' in qemuBuildTLSx509BackendProps
qemu: command: Optimize formatting of 'passwordid' in qemuBuildTLSx509BackendProps

Use the 'S' modifier for create the field optionally rather than calling
another JSON formatter function.

Signed-off-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

olafhering/libvirt,andreabolognani/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,zippy2/libvirt,crobinso/libvirt,jardasgit/libvirt,jfehlig/libvirt,eskultety/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,crobinso/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,olafhering/libvirt,jardasgit/libvirt,eskultety/libvirt,libvirt/libvirt,zippy2/libvirt,nertpinx/libvirt,zippy2/libvirt,olafhering/libvirt,andreabolognani/libvirt,olafhering/libvirt,eskultety/libvirt,libvirt/libvirt,eskultety/libvirt,jfehlig/libvirt,nertpinx/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,crobinso/libvirt,eskultety/libvirt,libvirt/libvirt,crobinso/libvirt,jardasgit/libvirt,nertpinx/libvirt,jardasgit/libvirt,andreabolognani/libvirt,jardasgit/libvirt,zippy2/libvirt,nertpinx/libvirt,libvirt/libvirt,jfehlig/libvirt