Tests: removed unused Config imports.

h2_headers.t

diff --git a/h2_headers.t b/h2_headers.t
index d407c77..83e2a05 100644
--- a/h2_headers.t
+++ b/h2_headers.t
@@ -13,8 +13,6 @@
 
 use Test::More;
 
-use Config;
-
 BEGIN { use FindBin; chdir($FindBin::Bin); }
 
 use lib 'lib';

js_headers.t

diff --git a/js_headers.t b/js_headers.t
index f96b51e..fa072ef 100644
--- a/js_headers.t
+++ b/js_headers.t
@@ -12,8 +12,6 @@
 
 use Test::More;
 
-use Config;
-
 BEGIN { use FindBin; chdir($FindBin::Bin); }
 
 use lib 'lib';

mp4.t

diff --git a/mp4.t b/mp4.t
index c492198..8280c2f 100644
--- a/mp4.t
+++ b/mp4.t
@@ -13,8 +13,6 @@
 
 use Test::More;
 
-use Config;
-
 BEGIN { use FindBin; chdir($FindBin::Bin); }
 
 use lib 'lib';