Remove leftovers of platformName and platformStatic in test data

Drop unnecessary imports, rename some tests

compiler/testData/codegen/boxWithJava/jvmStatic/annotations.kt

@@ -1,6 +1,5 @@
 // FILE: Test.java
 
-import java.lang.String;
 import java.lang.annotation.Annotation;
 
 class Test {
@@ -31,8 +30,6 @@ class Test {
 
 // FILE: test.kt
 
-import kotlin.jvm.JvmStatic
-
 @Retention(AnnotationRetention.RUNTIME)
 annotation class testAnnotation