Updated 'core' to latest commit (closeFile() is now lesser noisy).

Signed-off-by: Roland Haeder <roland@mxchange.org>

diff --git a/core b/core
index bd147745864d29d1dcb0392f366cddae7eb38740..b44905516036bb2bfa05090740a4f83696776938 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit bd147745864d29d1dcb0392f366cddae7eb38740
+Subproject commit b44905516036bb2bfa05090740a4f83696776938