fix for 2.063

warning, explicit element-wise assignment templ[16LU..__dollar - 1LU] = (suffix)[] is better than templ[16LU..__dollar - 1LU] = suffix.

Minor fix for dmd version 2.063.

This appears to work correctly, make sure everything is good before pulling.
Also it says it is a warning, but it halts compilation every time using dub.