[easytag] Remove an unnecessary include

[David King <davidk src gnome org>]

commit 5cb07a6b41a3ac86625040824c9ca475f06f4dd4
Author: David King <amigadave amigadave com>
Date:   Sat Feb 14 00:00:01 2015 +0000

    Remove an unnecessary include

 src/et_core.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/src/et_core.c b/src/et_core.c
index 6e11fb2..ef363b8 100644
--- a/src/et_core.c
+++ b/src/et_core.c
@@ -19,7 +19,6 @@
 
 #include "et_core.h"
 
-#include "application_window.h"
 #include "file.h"
 #include "file_list.h"