Make the encrot table balanced

It won't change much. It is not possible to determine in which direction the encoder spun when two steps are made, so just use + or - 2.

Firmware/lcd.cpp

@@ -786,8 +786,8 @@ void lcd_buttons_update(void)
 	static const int8_t encrot_table[] PROGMEM = {
 		0, -1, 1, 2,
 		1, 0, 2, -1,
-		-1, 2, 0, 1,
-		2, 1, -1, 0,
+		-1, -2, 0, 1,
+		-2, 1, -1, 0,
 	};
 
 	static uint8_t enc_bits_old = 0;