Slider: Fix max calculation, when step is float

[dekajp]

Fixes #10721

new _calculateNewMax method uses while loop, the cost should be very minimum
since this method is called one time in life of control, in create method or
when setOption(max) is called.

below method uses math functions to avoid loop, but this was failing
unit tests of slider_options.

TODO : to avoid while loop in Max Calculation

_calculateNewMax: function() {
  var precision = this._precision();
  var multiplier = Math.pow( 10 , precision );
  var max = this.options.max * multiplier ;
  var min = this._valueMin() * multiplier ;
  var step = this.options.step * multiplier ;
  var remainder = ( max - min ) % step;
  this.max = ( ( max - remainder ) / multiplier ).toFixed(precision);
}

[jzaefferer]

@dekajp were you going to update this to address your own TODO?

[dekajp]

@jzaefferer I am not planning as of now.

[dekajp]

@jzaefferer i think i now know the reason why the TODO method was not working , this should fix it.
this.max = parseFloat( ( ( max - remainder ) / multiplier ).toFixed(precision) );

i will send a updated PR . i did not know toFixed was returning string. my bad

[scottgonzalez]

Please remove all of the extraneous parens.