bfs: enable the test_fstype test

This test would previously fail in the nix build sandbox.
It was fixed in version 1.2.2.

pkgs/tools/system/bfs/default.nix

@@ -11,8 +11,6 @@ stdenv.mkDerivation rec {
     sha256 = "0a7zsipvndvg1kp2i35jrg9y9kncj7i6mp36dhpj8zjmkm5d5b8g";
   };
 
-  # Disable fstype test, tries to read /etc/mtab
-  patches = [ ./tests.patch ];
   postPatch = ''
     # Patch tests (both shebangs and usage in scripts)
     for f in $(find -type f -name '*.sh'); do

pkgs/tools/system/bfs/tests.patch

@@ -1,10 +0,0 @@
---- a/tests.sh
-+++ b/tests.sh
-@@ -369,7 +369,6 @@
-     test_printf_nul
-     test_quit_after_print
-     test_quit_before_print
--    test_fstype
-     test_not
-     test_and
-     test_or