Fix DisplayProgressBar horizontal bar filling wrong side

The refactor in db59686 ("refactor code, inverse now a graph setting")
introduced shared x1/y1/x2/y2 defaults and assigned the wrong coordinate
in the horizontal non-reverse branch: x1 was set to bar_filled_width
instead of x2, which caused the bar to render the empty portion in
BAR_COLOR and the filled portion in BACKGROUND_COLOR.

Pre-refactor code drew [0, 0, bar_filled_width, height - 1] — i.e. x2
was the variable, not x1. Restoring that behavior fixes the inversion
while leaving the reverse_direction and vertical branches unchanged
(those were already correct after the refactor).

Fixes #982

Author: MondoBoricua

library/lcd/lcd_comm.py

@@ -378,7 +378,7 @@ def DisplayProgressBar(self, x: int, y: int, width: int, height: int, min_value:
             if reverse_direction is True:
                 x1 = width - bar_filled_width
             else:
-                x1 = bar_filled_width
+                x2 = bar_filled_width
         else:
             if reverse_direction is True:
                 y2 = height - bar_filled_height