Issue 4780 Y Axis Labels properly sized - clean fix

[drewster99]

Issue Link :https://github.com/danielgindi/Charts/issues/4780:

Y axis labels are improperly sized in some cases

Implementation Details :construction:

Old broken logic: Label size was determined by the CGSize of the label with the largest number of characters New logic: Label size is determined by the CGSize of the label with the largest CGSize

[drewster99]

@berbaspin @pmairoldi Any chances we can get this merged?