Use hard tabs for Makefiles (#9978)

If you use soft tabs by default, editing Makefiles will be broken as
they require tab indentation to parse correctly.

Release Notes;

- Changed default settings for `Makefile`s to use hard tabs.

assets/settings/default.json

@@ -560,6 +560,9 @@
         "source.organizeImports": true
       }
     },
+    "Make": {
+      "hard_tabs": true
+    },
     "Markdown": {
       "tab_size": 2,
       "soft_wrap": "preferred_line_length"