Remove setlocale() call (hopefully PEP 538 solved this)

src/xfel_calibrate/calibrate.py

@@ -583,10 +583,6 @@ def make_par_table(parms):
 
 def run(argv=None):
     """ Run a calibration task with parser arguments """
-    # Ensure files are opened as UTF-8 by default, regardless of environment.
-    if "readthedocs.org" not in sys.executable:
-        locale.setlocale(locale.LC_CTYPE, ('C', 'UTF-8'))
-
     if argv is None:
         argv = sys.argv