Fix false positive "Unused import directive" for imports under several alias

#KT-30949 Fixed

idea/testData/editor/optimizeImports/common/ConflictWithAlias2.kt

@@ -0,0 +1,11 @@
+import duration.*
+import duration.hours as hour
+import duration.minutes as minute
+import duration.minutes as minutes
+import duration.seconds as second
+import duration.seconds as seconds
+
+fun main() {
+    val totalDuration = 1.hour - 30.minutes + 1.second
+    println(totalDuration)
+}