Remove add to RoomFragment to backstack

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

@@ -75,13 +75,19 @@ abstract class AbstractFragmentActivity extends RxAppCompatActivity {
         .commit();
   }
 
-  protected void showFragmentWithTag(Fragment fragment, String tag) {
+  protected void showFragmentWithTagWithBackStack(Fragment fragment, String tag) {
     getSupportFragmentManager().beginTransaction()
             .replace(getLayoutContainerForFragment(), fragment, tag)
             .addToBackStack(null)
             .commit();
   }
 
+  protected void showFragmentWithTag(Fragment fragment, String tag) {
+    getSupportFragmentManager().beginTransaction()
+            .replace(getLayoutContainerForFragment(), fragment, tag)
+            .commit();
+  }
+
   protected void showFragmentWithBackStack(Fragment fragment) {
     getSupportFragmentManager().beginTransaction()
         .replace(getLayoutContainerForFragment(), fragment)