Fix IntentionTestGenerated$IntroduceImportAlias.testConflictPackage

Fix test data as find usages can handle import aliases

Relates to #KT-18619

idea/testData/intentions/introduceImportAlias/conflictPackage.kt.after

@@ -17,6 +17,6 @@ class Test() {
     }
 
     fun test2() {
-        val i = Middle1.Inner.SIZE
+        val i = Middle2.Inner.SIZE
     }
 }