Redundant curly braces in string template: do not report labeled 'this'

#KT-35475 Fixed

idea/testData/inspectionsLocal/removeCurlyBracesFromTemplate/necessaryBrackets8.kt

@@ -0,0 +1,12 @@
+// PROBLEM: none
+fun main() {
+    "hello".foo()
+}
+
+fun bar(block: Int.() -> Unit) { block(42) }
+
+fun String.foo() = bar {
+    println("this: <caret>${this@foo}")
+}
+
+fun println(s: String) {}