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Set self._data_dtype in scale_and_set_data for CPU scaled textures (#2601)

I noticed this warning when running tests, and I think it traces back to
the change in this PR.

```
vispy/visuals/tests/test_colormap.py: 6 warnings
vispy/visuals/tests/test_image.py: 39 warnings
vispy/visuals/tests/test_scalable_textures.py: 4 warnings
  /Users/aandersoniii/src/vispy/vispy/gloo/texture.py:18: DeprecationWarning: finfo() dtype cannot be None. This behavior will raise an error in the future. (Deprecated in NumPy 1.25)
    info = np.finfo(dtype)
```

See https://github.com/vispy/vispy/pull/2350#discussion_r1638869690 for
some context.

I am partly guessing what this code meant to be doing, but here the
`_data_dtype` is set the first time `scale_and_set_data` is called.
@brisvag at your suggestion I am trying to think of a test that could
have caught this, but need to think about it a little more.

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