Remove braces from 'when' entry: do not suggest when statement is lambda that has no arrow

#KT-35288 Fixed

idea/testData/intentions/removeBraces/whenLambda2.kt

@@ -0,0 +1,10 @@
+// IS_APPLICABLE: false
+fun test(v: Boolean): (String) -> Int {
+    return when (v) {
+        true -> <caret>{ { taskOne(it) } }
+        false -> { x -> taskTwo(x) }
+    }
+}
+
+fun taskOne(s: String) = s.length
+fun taskTwo(s: String) = 42

idea/testData/intentions/removeBraces/whenLambda3.kt

@@ -0,0 +1,9 @@
+fun test(v: Boolean): (String) -> Int {
+    return when (v) {
+        true -> <caret>{ { x -> taskOne(x) } }
+        false -> { x -> taskTwo(x) }
+    }
+}
+
+fun taskOne(s: String) = s.length
+fun taskTwo(s: String) = 42

idea/testData/intentions/removeBraces/whenLambda3.kt.after

@@ -0,0 +1,9 @@
+fun test(v: Boolean): (String) -> Int {
+    return when (v) {
+        true -> { x -> taskOne(x) }
+        false -> { x -> taskTwo(x) }
+    }
+}
+
+fun taskOne(s: String) = s.length
+fun taskTwo(s: String) = 42