Adapted completion in lambda signatures to modern syntax

idea/idea-completion/testData/basic/common/lambdaSignature/ParameterName1.kt

@@ -1,7 +0,0 @@
-fun bar() {
-    val handler = { (<caret>) }
-}
-
-// INVOCATION_COUNT: 0
-// EXIST: bar
-// EXIST: null

idea/idea-completion/testData/basic/common/lambdaSignature/ParameterName2.kt

@@ -1,5 +1,5 @@
 fun bar() {
-    val handler = { (i: Int, <caret>) }
+    val handler = { i: Int, <caret> }
 }
 
 // NUMBER: 0

idea/idea-completion/testData/basic/common/lambdaSignature/ParameterName3.kt

@@ -1,5 +0,0 @@
-fun bar() {
-    val handler = { (i, <caret>) }
-}
-
-// NUMBER: 0

idea/idea-completion/testData/basic/common/lambdaSignature/ParameterType1.kt

@@ -1,5 +1,5 @@
 fun bar() {
-    val handler = { (i: <caret>) }
+    val handler = { i: <caret> }
 }
 
 // EXIST: Int

idea/idea-completion/testData/basic/common/lambdaSignature/ParameterType2.kt

@@ -1,8 +0,0 @@
-fun bar() {
-    val handler = { (i: <caret> }
-}
-
-// EXIST: Int
-// EXIST: String
-// ABSENT: bar
-// ABSENT: handler

idea/idea-completion/testData/basic/common/lambdaSignature/ParameterType3.kt

@@ -1,5 +1,5 @@
 fun bar() {
-    val handler = { (i: Int, s: <caret> }
+    val handler = { i: Int, s: <caret> }
 }
 
 // EXIST: Int

idea/idea-completion/testData/basic/common/lambdaSignature/ParameterType4.kt

@@ -1,5 +1,5 @@
 fun bar() {
-    val handler = { (i: List<<caret>>) }
+    val handler = { i: List<<caret>> }
 }
 
 // EXIST: Int

idea/idea-completion/testData/basic/common/lambdaSignature/ParameterType5.kt

@@ -1,5 +1,5 @@
 fun bar() {
-    val handler = { (i: Map<String, <caret> }
+    val handler = { i: Map<String, <caret> }
 }
 
 // EXIST: Int