[Chapel Merge] Fix chpl_launchcmd syntax error introduced in #21907

Branch: refs/heads/main
Revision: df14e46a9c65e1e1d0b2d1cda602cfa512ca8ce6
Author: ronawho
Link: Fix chpl_launchcmd syntax error introduced in #21907 by ronawho · Pull Request #21960 · chapel-lang/chapel · GitHub
Log Message:
Fix chpl_launchcmd syntax error introduced in #21907 (#21960)

[reviewed by @mppf]

Fix chpl_launchcmd syntax error introduced in #21907

Compare: Comparing 9c0f86b1761c8b32ca48140197ce32641ee31ff3...b05ad4b7b4a7b0a58c8205e22a85c6f1286340ba · chapel-lang/chapel · GitHub

Diff:
M util/test/chpl_launchcmd.py
https://github.com/chapel-lang/chapel/pull/21960.diff