Report syntax error on unescaped annotation

Also adjust parser testData

compiler/testData/psi/annotation/targeted/onFile/withoutPackageWithSimpleAnnotation.kt

@@ -1,4 +1,4 @@
 @file:foo
-foo bar
+@foo @bar
 @file: baz
 fun foo() {}

compiler/testData/psi/annotation/targeted/onFile/withoutPackageWithSimpleAnnotation.txt

@@ -18,6 +18,7 @@ JetFile: withoutPackageWithSimpleAnnotation.kt
   FUN
     MODIFIER_LIST
       ANNOTATION_ENTRY
+        PsiElement(AT)('@')
         CONSTRUCTOR_CALLEE
           TYPE_REFERENCE
             USER_TYPE
@@ -25,6 +26,7 @@ JetFile: withoutPackageWithSimpleAnnotation.kt
                 PsiElement(IDENTIFIER)('foo')
       PsiWhiteSpace(' ')
       ANNOTATION_ENTRY
+        PsiElement(AT)('@')
         CONSTRUCTOR_CALLEE
           TYPE_REFERENCE
             USER_TYPE