fix: remove time.Sleep from SSD1306 SPI transfer code

Author: mateusznowakdev

ssd1306/ssd1306.go

@@ -322,15 +322,13 @@ func (b *SPIBus) tx(data []byte, isCommand bool) error {
 
 	if isCommand {
 		b.csPin.High()
-		time.Sleep(1 * time.Millisecond)
 		b.dcPin.Low()
 		b.csPin.Low()
 
 		err = b.wire.Tx(data, nil)
 		b.csPin.High()
 	} else {
 		b.csPin.High()
-		time.Sleep(1 * time.Millisecond)
 		b.dcPin.High()
 		b.csPin.Low()