[Wi-Fi] Remove redundant code in WifiSettings2

WifiPickerTracker get WifiEntries at onStart, it's no meaning
to getWifiEntry at WifiSettings2#onActivityCreated.

Bug: 143328194
Test: manual
      Edit a Wi-Fi network by clicking context menu 'Modify',
      rotate the WiFiDialog and see if any thing wrong

Change-Id: I9746879720b72723259e1b59e8b5e8bae183b8cc

src/com/android/settings/wifi/WifiSettings2.java

@@ -326,18 +326,6 @@ public class WifiSettings2 extends RestrictedSettingsFragment
         if (savedInstanceState != null) {
             mDialogMode = savedInstanceState.getInt(SAVE_DIALOG_MODE);
             mDialogWifiEntryKey = savedInstanceState.getString(SAVE_DIALOG_WIFIENTRY_KEY);
-
-            if (!TextUtils.isEmpty(mDialogWifiEntryKey)) {
-                List<WifiEntry> wifiEntries = mWifiPickerTracker.getWifiEntries();
-                Optional<WifiEntry> matchedWifiEntry = wifiEntries.stream().filter(wifiEntry ->
-                        TextUtils.equals(wifiEntry.getKey(), mDialogWifiEntryKey)).findAny();
-                if (matchedWifiEntry.isPresent()) {
-                    mDialogWifiEntry = matchedWifiEntry.get();
-                } else {
-                    throw new IllegalStateException("Failed to restore WifiEntry of key: "
-                            + mDialogWifiEntryKey);
-                }
-            }
         }
 
         // If we're supposed to enable/disable the Next button based on our current connection