configfile: Support config.getchoice() with integer keys

If the choice mapping uses integer keys then lookup the config option
using self.getint().  This simplifies the callers and improves the
encoding of the printer.configfile.settings export.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/extras/display/hd44780.py

@@ -7,8 +7,8 @@
 import logging
 
 BACKGROUND_PRIORITY_CLOCK = 0x7fffffff00000000
-LINE_LENGTH_DEFAULT="20"
-LINE_LENGTH_OPTIONS={"16":16, "20":20}
+LINE_LENGTH_DEFAULT=20
+LINE_LENGTH_OPTIONS={16:16, 20:20}
 
 TextGlyphs = { 'right_arrow': '\x7e' }
 
@@ -22,9 +22,9 @@ class HD44780:
         pins = [ppins.lookup_pin(config.get(name + '_pin'))
                 for name in ['rs', 'e', 'd4', 'd5', 'd6', 'd7']]
         self.hd44780_protocol_init = config.getboolean('hd44780_protocol_init',
-            True)
+                                                       True)
         self.line_length = config.getchoice('line_length', LINE_LENGTH_OPTIONS,
-            LINE_LENGTH_DEFAULT)
+                                            LINE_LENGTH_DEFAULT)
         mcu = None
         for pin_params in pins:
             if mcu is not None and pin_params['chip'] != mcu:
@@ -43,9 +43,9 @@ class HD44780:
         self.all_framebuffers = [
             # Text framebuffers
             (self.text_framebuffers[0], bytearray('~'*2*self.line_length),
-              0x80),
+             0x80),
             (self.text_framebuffers[1], bytearray('~'*2*self.line_length),
-              0xc0),
+             0xc0),
             # Glyph framebuffer
             (self.glyph_framebuffer, bytearray('~'*64), 0x40) ]
     def build_config(self):