Regression in plotting of 1d datasets using plot dataset

[jenshnielsen]

Consider the example here https://qcodes.github.io/Qcodes/examples/Parameters/Simple-Example-of-ParameterWithSetpoints.html#Measurement before qcodes 0.25 this used to be plotted as a line plot but in 0.26.0 onwards this is now plotted as a scatter plot.

Some debugging indicate that this is because the setpoints and probably also data has gained an extra singleton dimension this means that np.all_close in datatype_from_setpoints_1d will always return True since [[1,2,3,...]] and [1,2,3,...] are always identical due to broadcasting.

[jenshnielsen]

This looks like a bug in #3024

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