Remove obselete property on .ui-datatable-scrollable-wrapper

[nate-knight]

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Plunkr Case (Bug Reports)
Please fork the plunkr below and create a case demonstrating your bug report. Issues without a plunkr have much less possibility to be reviewed.

http://plnkr.co/edit/6q5v84DWolH6DeAdi70w?p=preview

Current behavior
Non-existing 'max-height' class is getting applied to scrollable tables on the .ui-datatable-scrollable-wrapper node.

Expected behavior
.ui-datatable-scrollable-wrapper should not have 'max-height' applied as a class to .ui-datatable-scrollable-wrapper. The style 'max-height' is already being applied to another element, .ui-datatable-scrollable-body, which is correct.

Minimal reproduction of the problem with instructions
See 'max-height' class getting applied to .ui-datatable-scrollable-wrapper node:
http://embed.plnkr.co/coNQlXE9NVgonQHf2urP/

What is the motivation / use case for changing the behavior?
To clean up superfluous code that may cause confusion.

Please tell us about your environment:

• Angular version: 2.0.X

• PrimeNG version: 2.0.X
  4.2.2

• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X
  all

• Language: [all | TypeScript X.X | ES6/7 | ES5]

• Node (for AoT issues): node --version =

[cagataycivici]

Fixed via PR