Fix Bug #1833943 - CapsLock using long-press doesn't update keys.

Use new API in KeyboardView to invalidate all keys on long-press of shift key.

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

@@ -55,7 +55,7 @@ public class LatinKeyboardView extends KeyboardView {
             return true;
         } else if (key.codes[0] == Keyboard.KEYCODE_SHIFT) {
             getOnKeyboardActionListener().onKey(KEYCODE_SHIFT_LONGPRESS, null);
-            invalidate();
+            invalidateAllKeys();
             return true;
         } else if (key.codes[0] == '0' && getKeyboard() == mPhoneKeyboard) {
             // Long pressing on 0 in phone number keypad gives you a '+'.