Remove leftovers of platformName and platformStatic in test data

Drop unnecessary imports, rename some tests

compiler/testData/diagnostics/testsWithStdLib/annotations/jvmStatic/localFun.kt

@@ -0,0 +1,6 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+fun main(args: Array<String>) {
+    <!JVM_STATIC_NOT_IN_OBJECT!>@JvmStatic fun a()<!>{
+
+    }
+}