[gimp] plug-ins: missing backslash broke EXTRA_DIST.

[Jehan <jehanp src gnome org>]

commit ee4e9bfee520e1a6f40784814f23dc78aea95e5b
Author: Jehan <jehan girinstud io>
Date:   Sun Jul 28 23:47:05 2019 +0200

    plug-ins: missing backslash broke EXTRA_DIST.
    
    Because of this, EXTRA_DIST was empty, hence images and XML resource
    file were missing from the distributed files.

 plug-ins/gfig/images/Makefile.am | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/plug-ins/gfig/images/Makefile.am b/plug-ins/gfig/images/Makefile.am
index 1288d03d68..d68adf87c1 100644
--- a/plug-ins/gfig/images/Makefile.am
+++ b/plug-ins/gfig/images/Makefile.am
@@ -18,7 +18,7 @@ STOCK_IMAGES = \
        gfig-star.png           \
        gfig-logo.png
 
-EXTRA_DIST =
+EXTRA_DIST = \
        $(STOCK_IMAGES)         \
        gfig-icon-images.gresource.xml