stty/flags: Add missing tabs combination setting

Author: 3v1n0

src/uu/stty/src/flags.rs

@@ -385,4 +385,5 @@ pub const COMBINATION_SETTINGS: &[(&str, bool)] = &[
     ("pass8", true),
     ("raw", true),
     ("sane", false),
+    ("tabs", true),
 ];