Update writeOut to include isatty (#6602)

Added these lines so that QGIS 3 python console works in window

python/console/console_output.py

@@ -80,6 +80,9 @@ def get_end_pos(self):
     def flush(self):
         pass
 
+    def isatty(self):
+        return False
+
 
 class ShellOutputScintilla(QsciScintilla):