[NI] Fix inference if inner system has only by "uninteresting" constraint

#KT-32250 fixed

compiler/testData/diagnostics/tests/inference/regressions/kt32250.kt

@@ -0,0 +1,30 @@
+// !LANGUAGE: +NewInference
+// !DIAGNOSTICS: -UNUSED_PARAMETER -UNUSED_VARIABLE
+
+interface I {
+    fun foo()
+}
+
+data class Pair<X, Y>(val fst: X, val snd: Y)
+
+class A(f: Pair<Int, (I) -> Unit>? = null)
+
+class B(f: ((I) -> Unit)? = null)
+
+fun main() {
+    val cond = true
+    A(
+        if (cond) {
+            Pair(1, { baz -> baz.foo() })
+        } else {
+            null
+        }
+    )
+    B(
+        if (cond) {
+            { baz -> baz.foo() }
+        } else {
+            null
+        }
+    )
+}

compiler/testData/diagnostics/tests/inference/regressions/kt32250.txt

@@ -0,0 +1,36 @@
+package
+
+public fun main(): kotlin.Unit
+
+public final class A {
+    public constructor A(/*0*/ f: Pair<kotlin.Int, (I) -> kotlin.Unit>? = ...)
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class B {
+    public constructor B(/*0*/ f: ((I) -> kotlin.Unit)? = ...)
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface I {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final data class Pair</*0*/ X, /*1*/ Y> {
+    public constructor Pair</*0*/ X, /*1*/ Y>(/*0*/ fst: X, /*1*/ snd: Y)
+    public final val fst: X
+    public final val snd: Y
+    public final operator /*synthesized*/ fun component1(): X
+    public final operator /*synthesized*/ fun component2(): Y
+    public final /*synthesized*/ fun copy(/*0*/ fst: X = ..., /*1*/ snd: Y = ...): Pair<X, Y>
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}