Duplicated wind speed entries lead to errors

I couldn't reproduce the full load hours previously set (1956.164053)
even with older versions of python (checked down to 3.8) and pandas
(checked down to 1.3.5), so I assume, that the value was incorrect. It
was possibly not checked, as the example tests are not in the tests
directory but the example directory.

…k is run using pytest_notebook

…d on the other np.int64

…64 and on linux np.int32

…inux int64

…are run on github

…he right int32

…ors"

This reverts commit 07649a9.

…o 13] Permission denied

…ocstring test)