[folks] tests: Remove errornous c-header reference of extern method

[Rico Tzschichholz <ricotz src gnome org>]

commit 78b24b8cb01e27e352de2aca93934833bcb412b8
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Thu Jul 4 12:49:54 2019 +0200

    tests: Remove errornous c-header reference of extern method

 tests/lib/test-utils.vala | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/tests/lib/test-utils.vala b/tests/lib/test-utils.vala
index 702efec5..55dd4f25 100644
--- a/tests/lib/test-utils.vala
+++ b/tests/lib/test-utils.vala
@@ -27,8 +27,7 @@ using Gee;
 public class Folks.TestUtils
 {
   /* Implemented in C */
-  [CCode (cname = "haze_remove_directory",
-          cheader_filename = "haze-remove-directory.h")]
+  [CCode (cname = "haze_remove_directory")]
   public extern static bool remove_directory_recursively (string path);
 
   /**