Filter dropdown graphics don't support RTL

[MikeTschudi]

Using the example http://esri.github.io/calcite-web/documentation/patterns/#filter-dropdown and adding dir="rtl" to the html tag, one sees

Adding the following CSS appears to fix this for Chrome 65, Firefox 59, Edge 41, IE 11:

html[dir="rtl"] .filter-dropdown-link {
  padding: 0.51667rem 2rem 0.51667rem 1.55rem;
}

html[dir="rtl"] .filter-link-check {
  opacity: 0;
  visibility: hidden;
  margin-top: 6px;
  position: absolute;
  left: auto;  /* for IE11 */
  left: unset;
  right: 9px;
}

html[dir="rtl"] .filter-link-close {
  opacity: 0;
  visibility: hidden;
  margin-top: 6px;
  position: absolute;
  left: 9px;
  right: auto;  /* for IE11 */
  right: unset;
}

html[dir="rtl"] .filter-dropdown-remove .svg-icon {
  left: 0.65em;
}

html[dir="rtl"] .filter-dropdown-active {
  padding: 0.51667rem 0.51667rem 0.51667rem 0;
}

[macandcheese]

Thanks for the report - fixed in #942 - also made some slight alignment changes to the filter lists in both RTL and LTR.