zec-2.1 branch does not work with default showmetrics=1

[leto]

Compiling with default options and with an empty arrow.conf on Ubuntu 18.04 gives this:

$ ./arrowd -zindex

terminate called after throwing an instance of 'std::runtime_error' what(): tinyformat: Not enough conversion specifiers in format string Aborted (core dumped)

Using -showmetrics=0 avoids the issue. Looks like a merge issue

[j4ys0n]

good to go!