input: align-end demo is broken

[mmalerba]

The align-end demo for the input looks strange now, following #5141 it seems like the placeholder is right-aligned, but the input content is not. The placeholder animation is also strange, it seems to get clipped.

FWIW I'm not sure if the old behavior was exactly right either? previously the input content was right-aligned while the placeholder was not.

[jelbourn]

What demo? In demo-app/ or in material-examples/?

[mmalerba]

demo app, didn't check the examples