Missing `f` prefix on f-strings

[code-review-doctor]

Some strings looks like they're meant to be f-strings but are missing the f prefix meaning variable interpolation won't happen.

https://github.com/microsoft/computervision-recipes/blob/9380789c5fe47069aa58b33b59fdb15ead528e84/utils_cv/classification/parameter_sweeper.py#L152 https://github.com/microsoft/computervision-recipes/blob/9380789c5fe47069aa58b33b59fdb15ead528e84/utils_cv/classification/parameter_sweeper.py#L156 https://github.com/microsoft/computervision-recipes/blob/9380789c5fe47069aa58b33b59fdb15ead528e84/utils_cv/classification/data.py#L99

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