fixup! Use new builtin io.TextIOWrapper.reconfigure

nextstrain/cli/__main__.py

@@ -26,8 +26,6 @@ def reconfigure_stdio(stdio: TextIOWrapper):
     Suitable only for output streams (e.g. stdout, stderr), as reconfiguring an
     input stream is more complicated.
     """
-    # Flush any pending output under old configuration.
-    stdio.flush()
 
     # Configure new text stream on the same underlying buffered byte stream.
     stdio.reconfigure(
@@ -37,11 +35,7 @@ def reconfigure_stdio(stdio: TextIOWrapper):
         errors = "backslashreplace" if stdio is sys.stderr else "strict",
 
         # Explicitly enable universal newlines mode so we do the right thing.
-        newline = None,
-
-        # Preserve line buffering which is set at process start dynamically
-        # depending on what the stdio is actually attached to.
-        line_buffering = stdio.line_buffering)
+        newline = None)
 
 
 # Run when called as `python -m nextstrain.cli`, here for good measure.