fix lint

Author: hoc081098

app/src/main/res/layout/activity_main.xml

@@ -23,6 +23,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginStart="8dp"
+        android:layout_marginLeft="8dp"
         android:layout_marginBottom="8dp"
         android:text="TO SECOND"
         app:layout_constraintBottom_toBottomOf="parent"
@@ -35,6 +36,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginStart="8dp"
+        android:layout_marginLeft="8dp"
         android:text="SHOW DIALOG"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toStartOf="@+id/button_to_third"