JVM: enable indy lambdas in some tests explicitly

To simplify enabling of indy lambdas by default.

compiler/testData/codegen/box/invokedynamic/sam/functionExprToJavaInterface/extensionLambda2.kt

@@ -1,10 +1,11 @@
 // TARGET_BACKEND: JVM
 // JVM_TARGET: 1.8
 // SAM_CONVERSIONS: INDY
+// LAMBDAS: INDY
 
 // CHECK_BYTECODE_TEXT
 // JVM_IR_TEMPLATES
-// 1 java/lang/invoke/LambdaMetafactory
+// 2 java/lang/invoke/LambdaMetafactory
 
 // FILE: extensionLambda2.kt
 fun samExtLambda(ext: String.(String) -> String) = Sam(ext)
@@ -17,4 +18,4 @@ fun box(): String {
 // FILE: Sam.java
 public interface Sam {
     String get(String s1, String s2);
-}
+}