Minor. Merge multiplatformTypeRefinement testdata with multiplatform testdata

idea/testData/multiplatform/extensionOnExpect/common/common.kt

@@ -0,0 +1,3 @@
+expect class E {
+    fun commonMember()
+}

idea/testData/multiplatform/extensionOnExpect/dependencies.txt

@@ -0,0 +1,6 @@
+MODULE common { platform=[JVM, JS, Native]; root=common }
+MODULE jvm { platform=[JVM]; root=jvm }
+MODULE main { platform=[JVM]; root=main }
+
+jvm -> common { kind=DEPENDS_ON }
+main -> jvm { kind=DEPENDS_ON }

idea/testData/multiplatform/extensionOnExpect/jvm/jvm.kt

@@ -0,0 +1,5 @@
+actual class E {
+    actual fun commonMember() {}
+
+    fun platformMember() {}
+}

idea/testData/multiplatform/extensionOnExpect/main/main.kt

@@ -0,0 +1,4 @@
+fun E.test() {
+    commonMember()
+    platformMember()
+}