virsh: Fix --nvram and --keep-nvram help strings

The --nvram and --keep-nvram options of the undefine command can
be used regardless of the domain status (the only consumer so far
- qemuDomainUndefineFlags() doesn't care about the domain
status). Yet, their corresponding help strings say something
about inactive domains while manpage says nothing. Remove the
reference to domain state.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2007659
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>

tools/virsh-domain.c

@@ -3595,11 +3595,11 @@ static const vshCmdOptDef opts_undefine[] = {
     },
     {.name = "nvram",
      .type = VSH_OT_BOOL,
-     .help = N_("remove nvram file, if inactive")
+     .help = N_("remove nvram file")
     },
     {.name = "keep-nvram",
      .type = VSH_OT_BOOL,
-     .help = N_("keep nvram file, if inactive")
+     .help = N_("keep nvram file")
     },
     {.name = NULL}
 };