fix inspection warnings

Author: yole

gradle/android-mixed-java-kotlin-project/app/src/main/java/org/example/kotlin/mixed/JavaActivity.java

@@ -7,8 +7,6 @@
 import android.view.View;
 import android.widget.Button;
 
-import org.example.kotlin.mixed.KotlinActivity;
-
 public class JavaActivity extends Activity {
 
     @Override

gradle/android-mixed-java-kotlin-project/app/src/main/kotlin/org/example/kotlin/mixed/KotlinActivity.kt

@@ -12,7 +12,7 @@ class KotlinActivity : Activity() {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main2)
 
-        var next = findViewById(R.id.Button02) as Button
+        val next = findViewById(R.id.Button02) as Button
         next.setOnClickListener {
             val intent: Intent = Intent()
             setResult(RESULT_OK, intent)