coreui / coreui-pro / 32480242419

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fix(Caret): mirror the dropdown arrow in RTL (#825)

`.dropend` and `.dropstart` position their menu with logical properties, so
the panel already flips with the document direction — but the arrow was drawn
with `border-left` / `border-right` and stayed put. In RTL the menu opened to
the left while the triangle kept pointing right.

Measured on the toggle's pseudo-element, border widths as left/right/top/bottom:

           before          after
  .dropend  LTR  4/0/4/4    4/0/4/4
  .dropend  RTL  4/0/4/4    0/4/4/4
  .dropstart LTR 0/4/4/4    0/4/4/4
  .dropstart RTL 0/4/4/4    4/0/4/4

`caret-down` and `caret-up` are symmetric on the inline axis, so they render
identically either way.

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