MDC Text Field: Remove press ripple effect

[kfranqueiro]

We had a discussion between engineering and design last week, and determined that we're better off removing the press ripple effect from text field box and outlined text field. (Focus and hover states will remain in effect for text field box.)

Justifications:

• It's awkward to see a ripple when clicking/tapping inside an already-focused text field with the sole intent of relocating the cursor or selecting text
• There are already enough other visual indicators, e.g. the line ripple (which also animates based on the pointer's X coordinate), and the addition of focus shade when initially focusing a text field