Revert "Updated off-by-one erros due to improper rounding to integer in sparkline.py and display_shapes_sparkline.ticks.py"

This reverts commit 99435d8.

Author: Margaret Matocha

adafruit_display_shapes/sparkline.py

@@ -139,7 +139,7 @@ def update(self):
             self.y_top = self.y_max
 
         if len(self._spark_list) > 2:
-            xpitch = self.width / (
+            xpitch = (self.width-1) / (
                 len(self._spark_list) - 1
             )  # this is a float, only make int when plotting the line