[library-web] add back erroneously removed quirks line

[Frederic Peters <fpeters src gnome org>]

commit 04dc0818feddbeec48e270d1b4ec15ffa4a1b81a
Author: Frédéric Péters <fpeters 0d be>
Date:   Sat Jan 13 09:39:43 2018 +0100

    add back erroneously removed quirks line

 src/modtypes/gtkdoc.py |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/modtypes/gtkdoc.py b/src/modtypes/gtkdoc.py
index 35f65dc..9bb669c 100644
--- a/src/modtypes/gtkdoc.py
+++ b/src/modtypes/gtkdoc.py
@@ -102,6 +102,7 @@ class GtkDocModule(DocModule):
                     logging.warn('XInclude error, creating fake xsltproc return code')
                     xsltproc.returncode = 6
 
+                quirks = app.overlay.get_quirks(self)
                 if 'force-html-transform' in quirks:
                     logging.info('module marked as using html files, creating fake xsltproc return code')
                     xsltproc.returncode = 6