[TIMOB-15880] iOS: Label minimumFontSize broken

Description

minimumFontSize doesn't work on Ti 3.2.x

Reproduce steps

1. create mobile project (not alloy) 2. copy below source to app.js

var win = Ti.UI.createWindow({
    backgroundColor : 'white'
});

var label = Ti.UI.createLabel({
    top : 100,
    width : 300,
    height : 300,
    font : {
        fontSize: 100
    },
    borderColor : 'red',
    minimumFontSize : 10,
    text : 'This text shold be small.'
});

win.add(label);
win.open();

3. run in ios simulator

Actual result:

the label content is limited to a single line. There is no font size scaling.

Respected result:

minimumFontSize property enable font scaling to fit and forces the label content to be limited to a single line.