KVM: selftests: Fix spelling mistake "initally" -> "initially"

There is a spelling mistake in a literal string and in the function
test_get_inital_dirty. Fix them.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Message-ID: <20250204105647.367743-1-colin.i.king@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>