[gnome-apps-nightly] Books: Fix my fix

[Mathieu Bridon <mbridon src gnome org>]

commit 09227769256c95621e4b6ebf105d3d17219b55c4
Author: Mathieu Bridon <bochecha daitauha fr>
Date:   Fri Oct 6 17:44:03 2017 +0200

    Books: Fix my fix
    
    Sorry about that.

 org.gnome.Books.json |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/org.gnome.Books.json b/org.gnome.Books.json
index a17e07d..16fb839 100644
--- a/org.gnome.Books.json
+++ b/org.gnome.Books.json
@@ -172,7 +172,7 @@
         {
             "name": "gnome-books",
             "buildsystem": "meson",
-            "config-opts": [ "--Denable-documentation=false"],
+            "config-opts": [ "-Denable-documentation=false"],
             "sources": [
                 {
                     "type": "git",