Apply the change from commit 1d00fd77 (VS: Fix /MANIFESTUAC:NO linker
option mapping, 2018-11-21) to the v142 flag table.

There are no versions of `/MANIFESTUAC:NO` where addition values are
appended.  Remove both of the `MANIFESTUAC:NO` entries from our flag
tables and replace them with one which would set `EnableUAC` to false
and immediately stop processing the `/MANIFESTUAC:NO` option.