refactor(column-resize): simplify RTL handling

[crisbeto]

The various column resize components had a ton of boilerplate just to apply an ltr/rtl class. We can avoid it altogether by using [dir='rtl'] like we do in all of the other components.

[kseamon]

Any concern about ie support? https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/dir

[crisbeto]

I'm not sure why that table says that IE doesn't support it, because it definitely does from my testing. We've been using the attribute selector in all other components to support RTL.

[kseamon]

If you've tested it and it still works as expected, then LGTM.

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