ComplexRedundantLetInspection: fix highlight for multiple line receiver

#KT-31278 Fixed

idea/testData/inspectionsLocal/complexRedundantLet/multipleLines.kt

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+// HIGHLIGHT: INFORMATION
+
+fun test() {
+    runCatching {
+        /* lots of code*/
+    }.let<caret> { println(it) }
+}

idea/testData/inspectionsLocal/complexRedundantLet/multipleLines.kt.after

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+// HIGHLIGHT: INFORMATION
+
+fun test() {
+    println(runCatching {
+        /* lots of code*/
+    })
+}