core: Try to initialize TERM from systemd.tty.term.console as well

We already have the systemd.tty.xxx kernel cmdline arguments for
configuring tty's for services, let's make sure the term cmdline
argument applies to pid1 as well.

src/core/main.c

@@ -1425,6 +1425,12 @@ static int fixup_environment(void) {
         if (r < 0)
                 return r;
 
+        if (r == 0) {
+                r = proc_cmdline_get_key("systemd.tty.term.console", 0, &term);
+                if (r < 0)
+                        return r;
+        }
+
         t = term ?: default_term_for_tty("/dev/console");
 
         if (setenv("TERM", t, 1) < 0)