Replace all occurrences of WITH_RUNTIME with WITH_STDLIB

We are going to deprecate `WITH_RUNTIME` directive. The main reason
behind this change is that `WITH_STDLIB` directive better describes
its meaning, specifically it will add kotlin stdlib to test's classpath.

compiler/testData/codegen/box/fieldRename/jvmFieldNoClash1.kt

@@ -1,5 +1,5 @@
 // TARGET_BACKEND: JVM
-// WITH_RUNTIME
+// WITH_STDLIB
 
 // In the old JVM backend, FieldOwnerContext is sensitive to the order of properties which it invents name for. Companion object properties
 // are usually the first, so A.Companion.x here gets the name "x". After that it tries to invent a new name for A.x but fails because

compiler/testData/codegen/box/fieldRename/jvmFieldNoClash2.kt

@@ -1,5 +1,5 @@
 // TARGET_BACKEND: JVM
-// WITH_RUNTIME
+// WITH_STDLIB
 // FULL_JDK
 
 import java.lang.reflect.Modifier