fix regression in `zig run`

changes in 1dcf540426103e762925f3365898d65b1724fdf1 added a "double
free" of the progress node, causing a segfault for `zig run` when there
is a terminal attached. fixed.
e219f0c786Andrew Kelley committed on 10/25/2019, 5:03:12 PMparent952aa7a
1 file changedLine totals unavailable