Analysis API: fix call resolve inside plusAssign target

^KT-50864 fixed

analysis/analysis-api/testData/components/callResolver/resolveCall/assignments/insidePlusAssignTarget.kt

@@ -0,0 +1,5 @@
+// WITH_STDLIB
+
+fun foo(x: MutableMap<Int, MutableList<String>>) {
+    x.getOrPut(1) { <expr>mutableListOf</expr><String>() } += "str"
+}

analysis/analysis-api/testData/components/callResolver/resolveCall/assignments/insidePlusAssignTarget.txt

@@ -0,0 +1,12 @@
+KtSuccessCallInfo:
+  call = KtSimpleFunctionCall:
+    isImplicitInvoke = false
+    partiallyAppliedSymbol = KtPartiallyAppliedSymbol:
+      dispatchReceiver = null
+      extensionReceiver = null
+      signature = KtFunctionLikeSignature:
+        receiverType = null
+        returnType = kotlin.collections.MutableList<kotlin.String>
+        symbol = kotlin/collections/mutableListOf(): kotlin.collections.MutableList<T>
+        valueParameters = []
+    argumentMapping = {}