RFR: 8353002: Remove unnecessary Windows version check in WTaskbarPeer

[Phil Race]

On Fri, 28 Mar 2025 09:41:22 GMT, Daniel Gredler <dgredler at openjdk.org> wrote:

> WTaskbarPeer contains a check as to whether the current Windows version is Windows 7 or later. The current minimum supported version is Windows 10, so this is no longer needed.
> 
> There didn't seem to be a public test exercising this code, so I also added a basic Taskbar sanity test.

Marked as reviewed by prr (Reviewer).

-------------

PR Review: https://git.openjdk.org/jdk/pull/24287#pullrequestreview-2741219234