drop deprecated syntax for anonymous initializer blocks

compiler/testData/psi/annotation/ShortAnnotations.kt

@@ -17,7 +17,7 @@ class Foo {
   foo bar(1) buzz<T>(1) zoo var v : Int = 0
   foo bar(1) buzz<T>(1) zoo typealias T = Int
 
-  foo bar(1) buzz<T>(1) zoo {}
+  foo bar(1) buzz<T>(1) zoo init {}
 }
 
 fun test() {

compiler/testData/psi/annotation/ShortAnnotations.txt

@@ -896,6 +896,8 @@ JetFile: ShortAnnotations.kt
                   REFERENCE_EXPRESSION
                     PsiElement(IDENTIFIER)('zoo')
         PsiWhiteSpace(' ')
+        PsiElement(init)('init')
+        PsiWhiteSpace(' ')
         BLOCK
           PsiElement(LBRACE)('{')
           PsiElement(RBRACE)('}')