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

#KT-30949 Fixed

compiler/psi/src/org/jetbrains/kotlin/psi/KtFile.kt

@@ -175,7 +175,7 @@ open class KtFile(viewProvider: FileViewProvider, val isCompiled: Boolean) :
         importDirectives.firstOrNull { name == it.aliasName }
 
     fun findAliasByFqName(fqName: FqName): KtImportAlias? = importDirectives.firstOrNull {
-        fqName == it.importedFqName
+        it.alias != null && fqName == it.importedFqName
     }?.alias
 
     @Deprecated("") // getPackageFqName should be used instead