Change code to work with 20x4 LCD instead of 16x2

[johnwasser]

@Electrofinn

byte v1[8] = {
  B00000, B00000, B00000, B00000, B00000, B00000, B00000, B11111
};
byte v2[8] = {
  B00000, B00000, B00000, B00000, B00000, B00000, B00000, B11111
};

These two should probably not be the same.