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/lps22hb/main.go

@@ -9,29 +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 := lps22hb.New(machine.I2C1)
+	sensor.Configure()
 
 	if !sensor.Connected() {
 		println("LPS22HB not connected!")
 		return
 	}
 
-	sensor.Configure()
-
 	for {
-
 		p, _ := sensor.ReadPressure()
 		t, _ := sensor.ReadTemperature()
 		println("p =", float32(p)/1000.0, "hPa / t =", float32(t)/1000.0, "*C")
 		time.Sleep(time.Second)
 		// note: the device would power down itself after each query
-
 	}
 
 }