Minor: normalize '@Test' annotation casing in all tests.

libraries/stdlib/test/properties/delegation/MapAccessorsTest.kt

@@ -1,7 +1,7 @@
 package test.properties.delegation.map
 
 import kotlin.test.*
-import org.junit.Test as test
+import org.junit.Test
 
 class ValByMapExtensionsTest {
     val map: Map<String, String> = hashMapOf("a" to "all", "b" to "bar", "c" to "code")
@@ -18,7 +18,7 @@ class ValByMapExtensionsTest {
     val x: Double by genericMap
 
 
-    @test fun doTest() {
+    @Test fun doTest() {
         assertEquals("all", a)
         assertEquals("bar", b)
         assertEquals("code", c)
@@ -43,7 +43,7 @@ class VarByMapExtensionsTest {
     var a2: String by map2.withDefault { "empty" }
     //var x: Int by map2  // prohibited by type system
 
-    @test fun doTest() {
+    @Test fun doTest() {
         assertEquals("all", a)
         assertEquals(null, b)
         assertEquals(1, c)