Add multi file test for completion of enum entry

idea/testData/completion/basic/multifile/EnumEntry/EnumEntry.dependency.kt

@@ -0,0 +1,8 @@
+package test
+
+enum class EnumTest(val i: Int = 0) {
+    ENTRY1: EnumTest()
+    ENTRY2: EnumTest(1)
+}
+
+class EAnotherClass

idea/testData/completion/basic/multifile/EnumEntry/EnumEntry.kt

@@ -0,0 +1,8 @@
+package test
+
+fun main(args: Array<String>) {
+    EnumTest.E<caret>
+}
+
+// EXIST: ENTRY1, ENTRY2
+// ABSENT: EnumTest, EAnotherClass