Report syntax error on unescaped annotation

Also adjust parser testData

compiler/testData/psi/Properties_ERR.txt

@@ -187,6 +187,8 @@ JetFile: Properties_ERR.kt
   PsiWhiteSpace(' ')
   PROPERTY
     MODIFIER_LIST
+      PsiErrorElement:Use '@' symbol before annotations
+        <empty list>
       ANNOTATION_ENTRY
         CONSTRUCTOR_CALLEE
           TYPE_REFERENCE
@@ -226,4 +228,4 @@ JetFile: Properties_ERR.kt
         <empty list>
     PsiWhiteSpace(' ')
     PsiErrorElement:Property getter or setter expected
-      PsiElement(MINUS)('-')
+      PsiElement(MINUS)('-')