Inverted logic in assert in TEveVectorT on Windows

https://root.cern.ch/doc/master/TEveVector_8h_source.html

The exact same statement for assertion in Arr() function is used for Linux and Windows, but on Windows an if is used instead of static_assert, which basically inverts the logic (i.e. the error message is printed when everything is fine).

Besides, is the distinction even neccessary? The static_assert should work on Windows.