[Comctl32, User32]: Horizontal scrollbar handle unable to go to the bottom of large files

reactos-bootcd-0.4.17-dev-68-g15c9005-x86-gcc-lin-dbg

Related to CORE-19305

Wine 11.7 is affected too: https://bugs.winehq.org/show_bug.cgi?id=56787

• Open Notepad, disable word wrap
• write a 32K+ characters line
• Handle fails and can't reach rightmost position
• see https://github.com/reactos/reactos/commit/1dc2e6de728f90d2cd10f0fc7fea463425f7359f for inspiration for a fix