lint: Fix current lint issue in use of e.printStackTrace.

Author: jainkuniya

app/src/main/java/com/zulip/android/activities/ZulipActivity.java

@@ -651,7 +651,7 @@ public void onTextChanged(CharSequence s, int start, int before, int count) {
                 try {
                     streamsDrawerAdapter.changeCursor(getSteamCursorGenerator().call());
                 } catch (Exception e) {
-                    e.printStackTrace();
+                    ZLog.logException(e);
                 }
             }
 

app/src/main/java/com/zulip/android/networking/AsyncGetOldMessages.java

@@ -11,6 +11,7 @@
 import com.zulip.android.networking.response.GetMessagesResponse;
 import com.zulip.android.util.MessageListener;
 import com.zulip.android.util.MessageListener.LoadPosition;
+import com.zulip.android.util.ZLog;
 
 import org.apache.commons.lang.time.StopWatch;
 
@@ -211,7 +212,7 @@ protected boolean fetchMessages(int anchor, int numBefore, int numAfter,
                 return false;
             }
         } catch (IOException e) {
-            e.printStackTrace();
+            ZLog.logException(e);
             return false;
         }