Fix Nano 33 BLE drivers (#351)

Fix HTS221, LPS22HB and APDS9960 drivers and their examples for Arduino Nano 33 BLE:

* Update hts221_nano_33_ble.go
* Update lps22hb_nano_33_ble.go
* Update apds9960_nano_33_ble.go

examples/hts221/main.go

@@ -9,28 +9,27 @@ import (
 
 func main() {
 
+	// use Nano 33 BLE Sense's internal I2C bus
 	machine.I2C1.Configure(machine.I2CConfig{
-		SCL:       machine.P0_15, // SCL1 on Nano 33 BLE Sense
-		SDA:       machine.P0_14, // SDA1 on Nano 33 BLE Sense
+		SCL:       machine.SCL1_PIN,
+		SDA:       machine.SDA1_PIN,
 		Frequency: machine.TWI_FREQ_400KHZ,
 	})
 
 	sensor := hts221.New(machine.I2C1)
 
+	sensor.Configure() // power on and calibrate
+
 	if !sensor.Connected() {
 		println("HTS221 not connected!")
 		return
 	}
 
-	sensor.Configure() // power on and calibrate
-
 	for {
-
 		h, _ := sensor.ReadHumidity()
 		t, _ := sensor.ReadTemperature()
 		println("h =", float32(h)/100.0, "% / t =", float32(t)/1000.0, "*C")
 		time.Sleep(time.Second)
-
 	}
 
 }