[gtksourceview] logtalk.lang: Fix as/2 infix operator highlighting

[Christian Hergert <chergert src gnome org>]

commit 7553e15a920fdabf36174e9c2ba55d37ecade4f0
Author: Paulo Moura <pmoura logtalk org>
Date:   Wed Jan 9 14:13:58 2019 +0000

    logtalk.lang: Fix as/2 infix operator highlighting

 data/language-specs/logtalk.lang | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/data/language-specs/logtalk.lang b/data/language-specs/logtalk.lang
index abd6592a..d6f16dc2 100644
--- a/data/language-specs/logtalk.lang
+++ b/data/language-specs/logtalk.lang
@@ -2,7 +2,7 @@
 <!--
 
  Author: Paulo Moura <pmoura logtalk org>
- Copyright (c) 2007-2018 Paulo Moura <pmoura logtalk org>
+ Copyright (c) 2007-2019 Paulo Moura <pmoura logtalk org>
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
@@ -311,7 +311,7 @@
       <!-- Existential quantifier -->
       <keyword>\^</keyword>
       <!-- Predicate aliases -->
-      <keyword>as</keyword>
+      <keyword>\bas\b</keyword>
     </context>
 
     <context id="number" style-ref="number">