[FEATURE] Trust: Disable Remove on incoming trust (RT-1878)

There is no point on trying to delete an incoming trust, so disable
its button and notify the user with a tooltip.
Yeah, I'm good with the text.

On Tue, Nov 11, 2014 at 9:36 AM, Vahe Hovhannisyan <notifications@github.com
> wrote:

> In src/jade/tabs/trust.jade:
>
> > @@ -320,7 +320,14 @@ section.col-xs-12.content(ng-controller="TrustCtrl")
> >                              cancel-button-css="btn btn-cancel"
> >                              cancel-button-text="cancel"
> >                              ng-hide="showPassword==true")
> > -                              button.btn.btn-block.btn-danger.submit(type="button", ng-click="load_orderbook()", l10n) Remove
> > +                              button.btn.btn-block.btn-danger.submit(type="button", ng-click="load_orderbook()", ng-show="component.limit._value.t !== 0", l10n) Remove
>
> component.limit._value.t !== 0 => canRemove()
>
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> <https://github.com/ripple/ripple-client/pull/1804/files#r20165638>.
>