Remove unnecessary function ToolbarLayoutManger::implts_createToolBar()

This function is not necessary. I have merged it into createToolbar().
There are just too many function calls when I try to get a backtrace.

Change-Id: I3b1c08b97e24ba18a268f105b00670ed2799f60a
Reviewed-on: https://gerrit.libreoffice.org/9308
Tested-by: LibreOffice gerrit bot <gerrit@libreoffice.org>
Reviewed-by: Chris Sherlock <chris.sherlock79@gmail.com>