Fix two broken tests (missing actions)

Author: mglukhikh

idea/testData/quickfix/replaceWithSafeCallForScopeFunction/letWithWrongImplicitThis.kt

@@ -5,6 +5,7 @@
 // ACTION: Move lambda argument into parentheses
 // ACTION: Replace with safe (this?.) call
 // ACTION: Specify explicit lambda signature
+// ACTION: Add return@let
 // ERROR: Only safe (?.) or non-null asserted (!!.) calls are allowed on a nullable receiver of type String?
 
 fun String?.foo(a: String?) {

idea/testData/quickfix/replaceWithSafeCallForScopeFunction/letWithWrongParam.kt

@@ -4,6 +4,7 @@
 // ACTION: Introduce local variable
 // ACTION: Replace with safe (?.) call
 // ACTION: Surround with null check
+// ACTION: Add return@let
 // ERROR: Only safe (?.) or non-null asserted (!!.) calls are allowed on a nullable receiver of type String?
 
 fun foo(a: String?, b: String?) {