Fixed test data for new lambda syntax

compiler/testData/diagnostics/tests/shadowing/ShadowPropertyInClosure.kt

@@ -1,3 +1,3 @@
 val i = 17
 
-val f = { (): Int -> var i = 17; i }
+val f: () -> Int = { var i = 17; i }

compiler/testData/diagnostics/tests/shadowing/ShadowVariableInNestedClosure.kt

@@ -1,5 +1,5 @@
 fun f(): Int {
     var i = 17
-    <!UNUSED_FUNCTION_LITERAL!>{ (): Unit -> var <!NAME_SHADOWING, UNUSED_VARIABLE!>i<!> = 18 }<!>
+    <!UNUSED_FUNCTION_LITERAL!>{ var <!NAME_SHADOWING, UNUSED_VARIABLE!>i<!> = 18 }<!>
     return i
 }

compiler/testData/diagnostics/tests/shadowing/ShadowVariableInNestedClosureParam.kt

@@ -1,5 +1,5 @@
 fun ff(): Int {
     var i = 1
-    <!UNUSED_FUNCTION_LITERAL!>{ (i: Int) -> i }<!>
+    <!UNUSED_FUNCTION_LITERAL!>{ i: Int -> i }<!>
     return i
 }