Fix false positive "Unused import" for type alias

#KT-29977 Fixed

idea/testData/quickfix/optimizeImports/notRemoveImportsForTypeAliases2.before.Dependency.kt

@@ -0,0 +1,5 @@
+package test
+
+import MyEnum
+
+typealias Other = MyEnum

idea/testData/quickfix/optimizeImports/notRemoveImportsForTypeAliases2.before.Main.kt

@@ -0,0 +1,10 @@
+// "Optimize imports" "false"
+// ACTION: Introduce import alias
+
+import test.Other.HELLO<caret>
+
+val ONE = HELLO
+
+enum class MyEnum {
+    HELLO
+}