Fix 16x04 lines 3 and 4 (#23)

Thanks for the fix.

Author: petrkr

lcd/lcd_api.py

@@ -128,8 +128,10 @@ def move_to(self, cursor_x, cursor_y):
         addr = cursor_x & 0x3f
         if cursor_y & 1:
             addr += 0x40    # Lines 1 & 3 add 0x40
-        if cursor_y & 2:
-            addr += 0x14    # Lines 2 & 3 add 0x14
+        if cursor_y & 2 and self.num_columns == 16:
+            addr += 0x10    # Lines 3 & 4 add 0x10 for 16 cols and 0x14 for 20 cols
+        if cursor_y & 2 and self.num_columns == 20:
+            addr += 0x14
         self.hal_write_command(self.LCD_DDRAM | addr)
 
     def putchar(self, char):