NFC: fix typo

Co-authored-by: Bethany Nicholson <blnicho@users.noreply.github.com>

Author: jsiirola

pyomo/contrib/viewer/tests/test_qt.py

@@ -24,7 +24,7 @@
 UI Tests
 """
 # The pytest-qt plugin can generate exceptions / core dumps when it is
-# run in a terminal (without an axtive X11 screen).  Setting the
+# run in a terminal (without an active X11 screen).  Setting the
 # QT_QPA_PLATFORM environment variable *before* initializing Qt can work
 # around this error (see https://stackoverflow.com/a/74719383):
 import os