reinitialise method: do not always apply new options

[alexeylepesin]

TEST CASE:
https://jsfiddle.net/js8635hs/2/

1. Click on "Run scroller"
      the value of the alwaysShowVScroll option is true

2. change the value of the alwaysShowVScroll option to the false
      click on "Update scroller"
      the option was applied

3. Change the value of the option again alwaysShowVScroll to true
      click on "Update scroller"
      the option not applicable

Expected behavior: with each call to the reinitialise method, the options should be applied.

[illuusio]

It should at code level but it seems that jScrollPane needs test cases that this kind behavior get catch