Fix a bug at showing warning dialog at the first time when IME is trigerred in voice mode

java/src/com/android/inputmethod/latin/KeyboardSwitcher.java

java/src/com/android/inputmethod/latin/LatinIME.java

.../src/com/android/inputmethod/latin/LatinKeyboardView.java

java/src/com/android/inputmethod/latin/SubtypeSwitcher.java

.../src/com/android/inputmethod/voice/VoiceIMEConnector.java