[balsa] Fix pixmaps install path

[Peter Bloomfield <peterb src gnome org>]

commit 4d2060ea4f497469de6ab26caba5ed1bc152c31c
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Tue Nov 7 21:39:41 2017 -0500

    Fix pixmaps install path

 images/meson.build |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/images/meson.build b/images/meson.build
index 1c7e9c4..97c3561 100644
--- a/images/meson.build
+++ b/images/meson.build
@@ -14,7 +14,7 @@ balsa_imgs = [
   'balsa_logo.png'
   ]
 
-balsabitmapsdir = join_paths(get_option('datadir'), 'pixmaps')
+balsabitmapsdir = join_paths(get_option('datadir'), 'balsa', 'pixmaps')
 install_data(balsa_imgs, install_dir : balsabitmapsdir)
 
 if gtk_update_icon_cache_program.found()