Revert "InputMethodService: Fix ignore case in showInputMethodPickerFromClient"

This reverts commit f2e67a57.

Open Source Project CL: https://review.source.android.com/#change,16419
This change unexpectedly started preventing users from changing Input-Method.

How to reproduce
1. Long press "?123" button in LatinIME
2. Select "Input method"
3. No window will open.

Change-Id: Ie0d4b58900a9b06aa9d43f9fa0bea5165294fa30