K2: drop state mutation from LambdaWithTypeVariableAsExpectedTypeAtom init block

Related to KT-61933

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/inference/PostponedArguments.kt

@@ -42,7 +42,9 @@ fun Candidate.preprocessLambdaArgument(
             }?.type as ConeKotlinType?
 
             if (explicitTypeArgument == null || explicitTypeArgument.typeArguments.isNotEmpty()) {
-                return LambdaWithTypeVariableAsExpectedTypeAtom(argument, expectedType, this)
+                return LambdaWithTypeVariableAsExpectedTypeAtom(argument, expectedType, this).also {
+                    this.postponedAtoms += it
+                }
             }
         }
     }

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/inference/PostponedAtoms.kt

@@ -90,9 +90,6 @@ class LambdaWithTypeVariableAsExpectedTypeAtom(
     private val initialExpectedTypeType: ConeKotlinType,
     val candidateOfOuterCall: Candidate,
 ) : PostponedResolvedAtom(), LambdaWithTypeVariableAsExpectedTypeMarker {
-    init {
-        candidateOfOuterCall.postponedAtoms += this
-    }
 
     override var parameterTypesFromDeclaration: List<ConeKotlinType?>? = null
         private set