Fixed KT-5077 Code completion inserts FQ names inside lambda

#KT-5077 Fixed

idea/testData/completion/handlers/ClassCompletionInLambda.kt

@@ -0,0 +1,3 @@
+fun foo(list: List<String>) {
+    list.map { Stri<caret> }
+}

idea/testData/completion/handlers/ClassCompletionInLambda.kt.after

@@ -0,0 +1,3 @@
+fun foo(list: List<String>) {
+    list.map { String<caret> }
+}