Switch split dropdown buttons from using a caret to using a chevron
We are moving to using chevrons, isntead of carets within our dropdowns. The split dropdown button currently is using both in different places: ![gclZssP](/uploads/2e47490a96c56e337ca459af490460e5/gclZssP.png) ![Screen_Shot_2017-08-31_at_11.40.32_AM](/uploads/7a17b0ce7bf5f83c68c4a422604ef890/Screen_Shot_2017-08-31_at_11.40.32_AM.png) We should update all of these buttons to use the chevron, like the "Merge when pipeline succeeds" button.
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