Add end of line character

Author: tekktrik

displayio_cartesian.py

@@ -638,4 +638,4 @@ def clear_plot_lines(self, palette_index=5):
         rtype: None
         """
         self.plot_line_point = None
-        self._plot_bitmap.fill(palette_index)
+        self._plot_bitmap.fill(palette_index)