shared/format-table: do not print '.0'

shared/format-table: do not print '.0'

This makes output a bit shorter and nicer. For us, shorter output is generally
better.

Also, drop unnecessary UINT64_C macros. The left operand is always uint64_t,
and C upcasting rules mean that it doesn't matter if the right operand is
narrower or signed, the operation is always done on the wider unsigned type.