[RFR] Change LongTextInput to TextInput in examples/simple

[jaytula]

This is to fix console.warns of LongTextInput being deprecated and to use TextInput instead in the examples/simple app.

To see these error message:

make run-simple
// Navigate to http://localhost:8080
// Open the JavaScript console and try to Add a Post

[djhi]

Thanks!

[djhi]

Thanks!