[java.desktop/macOS] Condense SDRenderType usages in QuartzRenderer.m

The SDRenderType enum is often returned using a variable declared at the start of functions. These can be inlined in the return itself. Using a ternary operator condenses what may be 12 lines into one, in the most extreme cases. doRectUsingCG and doPolyUsingCG were both modified more than the rest, but still are equivalent.