[ENH] remove the max_iter parameter

[TonyBagnall]

removes the hard coded fix of n_iters to 50, should set through kwargs if required

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I have added the following labels to this PR based on the title: [ $\color{#FEF1BE}{\textsf{enhancement}}$ ].
I have added the following labels to this PR based on the changes made: [ $\color{#8649A7}{\textsf{experiments}}$ ]. Feel free to change these if they do not properly represent the PR.

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[MatthewMiddlehurst]

Failure is known and not caused by this, feel free to merge whenever. Out of interest why the change? If it is related to recent clustering happenings dont have to post here.