fix another d(e)select-upgrade typo

You would think one instance of this is enough, but
80e8d923ebc8d5f3f84eb3f922b28ca309c25026 wasn't as
globally applied as the commit message suggested…

LP: #1399037

apt-private/private-cmndline.cc

@@ -165,7 +165,7 @@ static bool addArgumentsAPTGet(std::vector<CommandLine::Args> &Args, char const
       addArg(0, "color", "APT::Moo::Color", 0);
 
    if (CmdMatches("install", "remove", "purge", "upgrade", "dist-upgrade",
-	    "deselect-upgrade", "autoremove", "clean", "autoclean", "check",
+	    "dselect-upgrade", "autoremove", "clean", "autoclean", "check",
 	    "build-dep", "full-upgrade", "source"))
    {
       addArg('s', "simulate", "APT::Get::Simulate", 0);