Make dpi_scale match original behavior #1936
Merged
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I arrived at previous solution because the original code used premultiplied values to round the result so I (incorrectly) assumed it was doing something akin to truncation.
Also replaced SFINAE with static_assert - got really carried away with it previously because I believed it provided better type checking integration; but they're the same and errors look the same.
Fixes #1930.