[Commonizer] Adapt CirUnderscoredTypeAliasSubstitutorTest

^KT-48288

native/commonizer/src/org/jetbrains/kotlin/commonizer/core/ClassOrTypeAliasTypeCommonizer.kt

@@ -125,6 +125,7 @@ internal class ClassOrTypeAliasTypeCommonizer(
         }
 
         if (candidates.isEmpty()) return null
+        if (candidates.size == 1) return candidates.first()
 
         return candidates.maxByOrNull { candidate -> types.count { it.classifierId == candidate } }!!
     }

native/commonizer/tests/org/jetbrains/kotlin/commonizer/transformer/CirUnderscoredTypeAliasSubstitutorTest.kt

@@ -8,7 +8,7 @@ package org.jetbrains.kotlin.commonizer.transformer
 import org.jetbrains.kotlin.commonizer.AbstractInlineSourcesCommonizationTest
 import org.jetbrains.kotlin.commonizer.assertCommonized
 
-class UnderscoredTypeAliasTypeSubstitutorTest : AbstractInlineSourcesCommonizationTest() {
+class UnderscoredTypeAliasTypeSubstitutonTest : AbstractInlineSourcesCommonizationTest() {
 
     fun `test inlined underscored typealias - single platform`() {
         val result = commonize {
@@ -61,7 +61,8 @@ class UnderscoredTypeAliasTypeSubstitutorTest : AbstractInlineSourcesCommonizati
             "(a, b)", """
                 typealias X = Int
                 typealias __X = X
-                expect fun x(x: X)
+                /* No hard requirement. Picking X over __X seems equally fine here */
+                expect fun x(x: __X)
             """.trimIndent()
         )
     }