Rename test data folder: libraries -> decompiler

idea/testData/decompiler/decompiledText/Enum.expected.kt

@@ -0,0 +1,12 @@
+// IntelliJ API Decompiler stub source generated from a class file
+// Implementation of methods is not available
+
+package test
+
+public final enum class Enum() : kotlin.Enum<test.Enum>, dependency.Tr {
+    ONE
+
+    THREE
+
+    TWO
+}