Remove leftovers of platformName and platformStatic in test data

Drop unnecessary imports, rename some tests

compiler/testData/compileJavaAgainstKotlin/jvmStatic/simpleObjectProperty.kt

@@ -0,0 +1,18 @@
+package test
+
+object A {
+    @JvmStatic val b: String = "OK"
+
+    var A.c: String
+        @JvmStatic get() = "OK"
+        @JvmStatic set(t: String) {}
+
+}
+
+fun main(args: Array<String>) {
+    A.b
+    with(A) {
+        A.c
+        A.c = "123"
+    }
+}