exec-invoke: only reset tty if we are told to

We have a setting for this, honour it also if we are invoked with
stdin passed in as fd.

Fixes: #29714

src/core/exec-invoke.c

@@ -393,7 +393,10 @@ static int setup_input(
                 /* Try to make this the controlling tty, if it is a tty, and reset it */
                 if (isatty(STDIN_FILENO)) {
                         (void) ioctl(STDIN_FILENO, TIOCSCTTY, context->std_input == EXEC_INPUT_TTY_FORCE);
-                        (void) reset_terminal_fd(STDIN_FILENO, true);
+
+                        if (context->tty_reset)
+                                (void) reset_terminal_fd(STDIN_FILENO, /* switch_to_text= */ true);
+
                         (void) exec_context_apply_tty_size(context, STDIN_FILENO, /* tty_path= */ NULL);
                 }