do not try to re-fix axis label overlaps when current autoangle:=90
do not try to re-fix axis label overlaps when current autoangle:=90

 N.B. during auto-margin redraw, if the axis fixed its label overlaps
 by rotating 90 degrees, do not attempt to re-fix its label overlaps
 as this can lead to infinite redraw loops!

 Moreover, use ax._prevTickAngles for retrieve "lastAngle".
 Previous ax._tickAngles was used, but this one gets clear early
 Axes.drawOne, so it didn't really do anything.

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