Deleted default text shall not be filled in again when recreated

The input screen presets the default text into the edit text widget if
UICC offers it in GET INPUT command. If user removes it, it should not
appear in the widget again when the activity is recreated.

Bug: 119663368
Test: Manually confirmed that the default text does not come back.

Change-Id: Ie678ad38e0f19f46cb8829b6160d973c7b33df4a
diff --git a/src/com/android/stk/StkInputActivity.java b/src/com/android/stk/StkInputActivity.java
index 6f3598a..356bcfc 100644
--- a/src/com/android/stk/StkInputActivity.java
+++ b/src/com/android/stk/StkInputActivity.java
@@ -401,10 +401,8 @@
         }
 
         String savedString = savedInstanceState.getString(INPUT_STRING_KEY);
-        if (!TextUtils.isEmpty(savedString)) {
-            mTextIn.setText(savedString);
-            updateButton();
-        }
+        mTextIn.setText(savedString);
+        updateButton();
 
         mAlarmTime = savedInstanceState.getLong(ALARM_TIME_KEY, NO_INPUT_ALARM);
         if (mAlarmTime != NO_INPUT_ALARM) {