style(3p/lisp): expand tabs in npg, mime4cl and sclf

Done using

    find third_party/lisp/{sclf,mime4cl,npg} \
      -name '*.lisp' -or -name '*.asd' \
      -exec bash -c 'expand -i -t 8 "$0" | sponge "$0"' {} \;

Change-Id: If84afac9c1d5cbc74e137a5aa0ae61472f0f1e90
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5066
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>

third_party/lisp/mime4cl/test/package.lisp

@@ -24,5 +24,5 @@
 
 (defpackage :mime4cl-tests
   (:use :common-lisp
-	:rtest :mime4cl)
+        :rtest :mime4cl)
   (:export))