Substitute type variables properly in ConeOverloadConflictResolver

#KT-46187 Fixed

compiler/fir/analysis-tests/testData/resolveWithStdlib/callableReferences/beyoundCalls.fir.txt

@@ -13,7 +13,7 @@ FILE: beyoundCalls.kt
     }
     public final fun foo(): R|kotlin/Unit| {
         lval x: R|(kotlin/String) -> kotlin/Int| = ::R|/bar|
-        lval y: <ERROR TYPE REF: Ambiguity: bar, [/bar, /bar]> = ::<Ambiguity: bar, [/bar, /bar]>#
+        lval y: R|kotlin/reflect/KFunction1<kotlin/String, kotlin/Int>| = ::R|/bar|
         lval z: R|kotlin/reflect/KFunction1<kotlin/String, kotlin/Int>| = ::R|/baz|
         lval w: R|(kotlin/String) -> kotlin/Int| = ::R|/foobaz<kotlin/String, kotlin/Int>|
         ::R|/baz|

compiler/fir/analysis-tests/testData/resolveWithStdlib/callableReferences/beyoundCalls.kt

@@ -6,7 +6,7 @@ fun <T, R> foobaz(x: T): R = TODO()
 
 fun foo() {
     val x: (String) -> Int = ::bar
-    val y = ::<!OVERLOAD_RESOLUTION_AMBIGUITY!>bar<!>
+    val y = ::bar
     val z = ::baz
     val w: (String) -> Int = ::foobaz