src: fix broken bookmarks functionality

(cherry picked from commit a5e2641b0ddb990757d131649066ff7df68ceee1)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

src/input/control.c

@@ -535,7 +535,7 @@ static void UpdateBookmarksOption( input_thread_t *p_input )
     {
         strcpy( psz_value, "bookmarks=" );
 
-        char *psz_next = psz_value + strlen( "bookmarks" );
+        char *psz_next = psz_value + strlen( "bookmarks=" );
 
         for( int i = 0; i < p_input->p->i_bookmark && psz_value != NULL; i++ )
         {