Change Ex1 to auto support both Button and Switch

[nseidle]

In general Ex1 should not require user to modify code. And since we have two devices with two different I2C addresses, Ex1 fails for half the users who don't read the comments (me).

Would be better to .begin() test for switch. And if that fails do a .begin() test for button. If that fails, then freeze. Otherwise, just work.