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Before this patch, we were showing a downward-pointing expander icon by taking a rightward-pointing one and rotating it 90deg. That's fine, except for RTL, where we tend to mirror rightward-pointing arrows with a `scale: -1 1;` rule. Because of order of operations, the scale rule is applied first, and the 90deg rotation that occurs afterwards ends up pointing the scaled arrow upwards. Instead of special-casing the scale rule for this expander icon, I've gone ahead and switched it to use arrow-dropdown-16.svg and gotten rid of the rotation. This way, even if we mirror across the y-axis with `scale: -1 1`, the appearance will not change. Differential Revision: https://phabricator.services.mozilla.com/D115268