resolves incorrect context issue in login activity

app/src/main/java/chat/rocket/android/activity/LoginActivity.java

 package chat.rocket.android.activity;
 
+import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
@@ -94,7 +95,8 @@ public class LoginActivity extends AbstractFragmentActivity implements LoginCont
     protected boolean onBackPress() {
         LoginFragment loginFragment = (LoginFragment) getSupportFragmentManager()
                 .findFragmentById(getLayoutContainerForFragment());
-        loginFragment.goBack();
+        Context loginActivityContext = this;
+        loginFragment.goBack(loginActivityContext);
         return true;
     }
 }

app/src/main/java/chat/rocket/android/fragment/server_config/LoginContract.java

 package chat.rocket.android.fragment.server_config;
 
+
+import android.content.Context;
+
 import java.util.List;
 
 import chat.rocket.android.shared.BaseContract;
@@ -19,13 +22,13 @@ public interface LoginContract {
 
         void showTwoStepAuth();
 
-        void goBack();
+        void goBack(Context ctx);
     }
 
     interface Presenter extends BaseContract.Presenter<View> {
 
         void login(String username, String password);
 
-        void goBack();
+        void goBack(Context ctx);
     }
 }

app/src/main/java/chat/rocket/android/fragment/server_config/LoginFragment.kt

 package chat.rocket.android.fragment.server_config
 
+import android.content.Context
 import android.os.Bundle
 import android.support.constraint.ConstraintLayout
 import android.support.design.widget.Snackbar
@@ -126,8 +127,8 @@ class LoginFragment : AbstractServerConfigFragment(), LoginContract.View {
         presenter.release()
         super.onPause()
     }
-
-    override fun goBack() {
-        presenter.goBack()
+    override fun goBack(ctx: Context?) {
+        presenter.goBack(ctx)
     }
+
 }

app/src/main/java/chat/rocket/android/fragment/server_config/LoginPresenter.kt

 package chat.rocket.android.fragment.server_config
 
+import android.content.Context
 import bolts.Continuation
 import bolts.Task
 import chat.rocket.android.BackgroundLooper
@@ -31,7 +32,7 @@ class LoginPresenter(private val loginServiceConfigurationRepository: LoginServi
         getLoginServices()
     }
 
-    override fun goBack() {
+    override fun goBack(ctx : Context?) {
         val context = RocketChatApplication.getInstance()
         val hostname = RocketChatCache.getSelectedServerHostname()
         hostname?.let {
@@ -39,7 +40,7 @@ class LoginPresenter(private val loginServiceConfigurationRepository: LoginServi
             RocketChatCache.clearSelectedHostnameReferences()
 
         }
-        LaunchUtil.showMainActivity(context)
+        LaunchUtil.showMainActivity(ctx)
     }
 
     override fun login(username: String, password: String) {